SYMBOLLON CORP
S-3, 2000-04-24
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
Previous: EQUITY MARKETING INC, 8-K, 2000-04-24
Next: BOMBARDIER CREDIT RECEIVABLES CORP, 8-K, 2000-04-24




     As filed with the Securities and Exchange Commission on April 24, 2000
                                                   Registration No. 333-______
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                   ----------
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933
                              SYMBOLLON CORPORATION
             (Exact name of registrant as specified in its charter)
                                   -----------

          Delaware                                            36-3463683
(State or other jurisdiction of                            (I.R.S. Employer
incorporation or organization)                           Identification No.)
                                  ------------
                                 37 Loring Drive
                              Framingham, MA 01702
                                 (508) 620-7676
   (Address, including zip code, and telephone number, including area code, of
                    registrant's principal executive offices)
                                  ------------

                                Paul C. Desjourdy
         President and Chief Operating Officer, Chief Financial Officer
                              Symbollon Corporation
                                 37 Loring Drive
                              Framingham, MA 01702
                                 (508) 620-7676
 (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)
                                  -------------
                                 With a copy to:
                               Norman Alpert, Esq.
                                  RubinBaum LLP
                              30 Rockefeller Plaza
                               New York, NY 10112
                                 (212) 698-7700
                                  -------------

Approximate  date of commencement  of proposed sale to the public:  From time to
time  after  the  effective  date of this  Registration  Statement.

If the only securities being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. [ ]


<PAGE>


If any of the  securities  being  registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment  plans,  check  the  following  box.  [x] If this  Form is filed to
register additional securities for an offering pursuant to Rule 462(b) under the
Securities  Act,  please check the  following  box and list the  Securities  Act
registration  statement number of the earlier effective  registration  statement
for the same  offering.  [ ] If this Form is a  post-effective  amendment  filed
pursuant to Rule 462(c) under the  Securities  Act,  check the following box and
list the Securities Act Registration  Statement number of the earlier  effective
registration  statement  for  the  same  offering.  [ ] If the  delivery  of the
prospectus  is  expected  to be made  pursuant  to Rule  434,  please  check the
following box. [ ]

<TABLE>
                         CALCULATION OF REGISTRATION FEE
<CAPTION>
- ---------------------------------------------------- ------------- ----------------- ------------------ --------------

Title of each class of securities to be registered    Amount to        Proposed      Proposed maximum     Amount of
                                                          be           maximum           aggregate      registration
                                                      registered    offering price    offering price         fee
                                                                    per share (1)
- ---------------------------------------------------- ------------- ----------------- ------------------ --------------
<S>                                                     <C>                <C>             <C>              <C>
Class A Common Stock                                      836,685          $5.90625      $4,941,670.78      $1,304.60
- ---------------------------------------------------- ------------- ----------------- ------------------ --------------

Class A Common Stock underlying warrants                  897,675             $6.00      $5,386,050.00      $1,421.92
- ---------------------------------------------------- ------------- ----------------- ------------------ --------------

Total                                                   1,734,360                          $10,327,721      $2,726.52
- ---------------------------------------------------- ------------- ----------------- ------------------ --------------
</TABLE>

(1) The price of $5.90625  per share,  which was the average of the high and low
sales price of the Class A Common Stock on the Nasdaq  SmallCap  Market on April
17, 2000, is set forth solely for the purpose of  calculating  the  registration
fee pursuant to Rule 457(c) under the  Securities  Act of 1933,  as amended (the
"Securities  Act"). The price of $6.00 per share,  which is the highest exercise
price of the warrants,  is set forth solely for the purpose of  calculating  the
registration fee pursuant to Rule 457(g)(1) under the Securities Act.
Pursuant to Rule 416(a)  under the  Securities  Act of 1933,  this  registration
statement  also  covers  such  indeterminable  additional  shares as may  become
issuable as a result of any future  stock  splits,  stock  dividends  of similar
transactions.  The registrant  hereby amends this  registration  on such date or
dates as may be necessary to delay its effective date until the registrant shall
file a further amendment which specifically  states that this registration shall
thereafter  become  effective in accordance  with Section 8(a) of the Securities
Act of 1933 or until the  Registration  Statement shall become effective on such
date as the Commission, acting pursuant to said Section 8(a), may determine.





<PAGE>


PROSPECTUS
                   SUBJECT TO COMPLETION, DATED APRIL 24, 2000

                              SYMBOLLON CORPORATION

                    1,734,360 SHARES OF CLASS A COMMON STOCK

This  prospectus  relates to the proposed sale of up to 1,734,360  shares of our
common  stock by  certain  selling  stockholders,  of which  897,675  shares are
underlying  warrants.  These  selling  stockholders  acquired  their  shares and
warrants in a 1999 private  placement of our  securities.  We will not
receive any of the proceeds from the sale of these shares.

Our  common  stock is traded on the  Nasdaq  SmallCap  Market  under the  symbol
"SYMBA".  On April 17, 2000, the last reported sale price of our common stock on
the Nasdaq SmallCap Market was $6.00 per share.

You  should  read this  entire  prospectus,  the  documents  we  incorporate  by
reference and any amendments or supplements to this prospectus  carefully before
you make your investment  decision.  See "Risk factors"  beginning on page 5 for
certain risks you should consider before you purchase any shares.

Neither  the  Securities  and  Exchange  Commission  nor  any  state  securities
commission has approved or  disapproved  of these  securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is a
criminal offense.

The information contained in this prospectus is not complete and may be changed.
These securities may not be sold until the registration statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to  sell  these  securities  and it is not  soliciting  an  offer  to buy  these
securities in any state where the offer or sale is not permitted.

                    The date of this prospectus is ________, 2000



<PAGE>


                                TABLE OF CONTENTS

                                                                          Page

Where You Can Find More Information........................................-2-

Note Concerning Forward Looking Statements.................................-3-

Symbollon Corporation......................................................-3-

Risk Factors...............................................................-5-

Use of Proceeds...........................................................-16-

Selling Stockholders......................................................-16-

Plan of Distribution......................................................-18-

Legal Matters.............................................................-20-

Experts...................................................................-20-

You should rely only on the  information  contained or incorporated by reference
in this prospectus and in any  accompanying  prospectus  supplement.  No one has
been authorized to provide you with different information.

You should not assume that the  information in this prospectus or any prospectus
supplement  is accurate as of any date other than the date on the front of those
documents.

                       WHERE YOU CAN FIND MORE INFORMATION

            We file annual,  quarterly and special reports, proxy statements and
other information with the Securities and Exchange  Commission,  commonly called
the SEC.  You may read and copy any  document  that we file at the SEC's  Public
Reference Room at 450 Fifth Street, N.W. Washington, D.C. 20549. Please call the
SEC at  1-800-SEC-0330  for further  information  on the operation of the Public
Reference  Room. Our SEC filings are also available to you free of charge at the
SEC's web site at http://www.sec.gov.

            The SEC allows us to  "incorporate  by reference" the information we
file with them, which means that we can disclose important information to you by
referring you to those documents.  The information  incorporated by reference is
an important part of this  prospectus,  and information  that we file later with
the SEC will automatically update and supercede this information. We incorporate
by reference the documents listed below and any future filings we will make with
the SEC under Sections 13(a),  13(c), 14 or 15(d) of the Securities Exchange Act
of 1934 until this offering has been completed:

                                       2
<PAGE>

    o                   Our Annual Report on Form 10-KSB for the year ended
                        December 31, 1999.
    o                   Our Proxy Statement for the 2000 Annual Meeting of
                        Stockholders to be held on May 24, 2000.
    o                   The  description  of our Class A Common Stock  contained
                        under the heading  "Description  of  Securities"  in our
                        Registration   Statement  on  From  SB-2   (Registration
                        Statement  No.   33-68828)   which  is  incorporated  by
                        reference  in our  Registration  Statement  on Form  8-A
                        under  the  Securities   Exchange  Act  of  1934,  dated
                        November 12, 1993,  including any  amendments or reports
                        filed for the purpose of updating such description.

            You  may  request  free  copies  of  these  filings  by  writing  or
telephoning  us at our  principal  office,  which is  located  at the  following
address:

                              Symbollon Corporation
                                 37 Loring Drive
                              Framingham, MA 01702
                       Attention: Chief Financial Officer
                                 (508) 620-7676

                   NOTE CONCERNING FORWARD LOOKING STATEMENTS

            All  statements  contained in this  Prospectus  and the documents we
incorporate  by  reference  that  are not  statements  of  historical  fact  are
"forward-looking  statements."  Sometimes  these  statements  contain words like
"believes,"  "belief," "plans,"  "anticipates,"  "expects,"  "estimates,  "may,"
"will" or similar  terms.  Forward-looking  statements  involve known or unknown
risks, uncertainties and other factors that could cause our actual results to be
materially  different  from  historical  results  or  from  any  future  results
expressed  or  implied by the  forward-looking  statements.  The "Risk  Factors"
section  of this  Prospectus,  beginning  on page 5,  summarizes  certain of the
material  risks  and   uncertainties   that  could  cause  our  actual  results,
performance  or  achievements  to  differ  materially  from  what we say in this
Prospectus and in the documents we  incorporate  by reference.  The Risk Factors
apply to all of our forward-looking statements.  Given these uncertainties,  you
should not place undue reliance on these forward-looking statements, which speak
only as of the date of this prospectus. We will not revise these forward-looking
statements to reflect events or circumstances  after the date of this Prospectus
or to reflect the occurrence of unanticipated events.

                              SYMBOLLON CORPORATION

         We are engaged in  development  and  commercialization  of  proprietary
iodine-based  pharmaceutical  agents  and  antimicrobials.  We  are  a  Delaware
corporation  formed  in  August  1993  and are the  successor  to a  corporation
initially  formed in July 1986. Our principal  executive office is located at 37
Loring  Drive,  Framingham,  Massachusetts  01702 and our  telephone  number  is
(508) 620-7676.

         We  have  developed  proprietary  iodine  technology  that  we  believe
maximizes the "therapeutic  index" of iodine. The "therapeutic  index" of a drug
is the ratio of the largest safe dose to the smallest effective dose. Iodine has

                                       3
<PAGE>

been shown to be a rapid acting,  broad-spectrum  antimicrobial and an effective
therapeutic for certain pharmaceutical applications. Our technology accomplishes
this by  controlling  the ratio of molecular  iodine (I2), to the other inactive
species  of  iodine  typically   present  in  solution.   We  believe  that  our
iodine-based  technology has potential use in several product application areas,
notably  women's   healthcare  and  infection   control.   Our  current  product
development work is focused on proposed product applications for a treatment for
fibrocystic  breast  disease and the  treatment  of various  dermatological  and
ophthalmic diseases.

Bovine Teat Sanitizer Product

         Since 1995,  we have marketed a bovine teat  sanitizer,  "IodoZyme(R)",
through  West Agro,  Inc. of Kansas City,  MO, a  subsidiary  of the Tetra Laval
Group and a leading manufacturer and distributor of iodophor-based  products for
dairy use. 1999 sales for IodoZyme were $425,209.

Women's Healthcare

         We have developed an oral dosage form of our technology which generates
molecular iodine in situ in the stomach of the patient.  We refer to this tablet
as IoGen(TM).  Based on the  available  scientific  literature,  we believe that
IoGen may be effective in the  prevention and treatment of certain female health
problems,  including some types of  pre-menopausal  breast  cancer,  fibrocystic
breast disease and endometriosis.

         Fibrocystic  breast  disease  is a benign  breast  condition  affecting
approximately  thirty percent of the women of childbearing age, which represents
in the United States about 24 million women.  However,  estimates  indicate that
only 3.3 million of those women have been formally diagnosed with the disease.

         During 1998, we began a multi-center Phase II clinical trial evaluating
IoGen in patients with moderate to severe fibrocystic breast disease to evaluate
the  clinical  effects  and safety of IoGen at three dose levels  compared  with
placebo in a group of  approximately  100 patients.  We anticipate that the data
from this trial will be available in the third quarter of 2000.

         During  1999,  we also  conducted a Phase I clinical  trial of IoGen to
determine dose proportionality and bioavailability of the drug. The results from
this Phase I study  should be available  in the second  quarter of 2000.  If the
results from these  clinical  trials  warrant,  we plan to continue the clinical
development  of  IoGen.  We may need  additional  resources  to do this.  If the
clinical  development of IoGen does continue,  we anticipate seeking a corporate
relationship with a pharmaceutical company to commercialize IoGen.

Ophthalmology and Dermatology Applications

         We   currently   plan  to  pursue   development   of   ophthalmic   and
dermatological products based on our technology. Resources allowing, our goal is
to initiate human  clinical  trials in  dermatology.  Since 1997, our efforts at
developing  ophthalmic  products have been made pursuant to a collaboration  and
sale/licence  agreement with Bausch & Lomb  Pharmaceuticals,  Inc. However, this
program  has  experienced  delays  and is  subject  to Bausch & Lomb's  right to
terminate.  A  collaboration  with  another  company to  develop  dermatological

                                       4
<PAGE>

products was terminated by that company in 1999.

Other Potential Applications

         We  believe  that our  technology  has  potential  applications  in the
development of a variety of human  healthcare and other products such as topical
anti-infectives, oral care and hygiene products, wound care applications, and as
a preventive for urinary tract infection. Given our limited resources,  although
certain  preliminary  research,  development  and  regulatory  activities may be
undertaken by us in some of these potential  product areas,  our ability to fund
the development and  commercialization of such applications will depend in large
part on entering into product development and commercialization  agreements with
corporate partners.

                                  RISK FACTORS

         Investing  in our common  stock is highly  speculative  and risky.  You
should be able to bear a  complete  loss of your  investment.  Before  making an
investment  decision,  you should carefully consider the following risk factors.
If any event or  circumstance  described in the following risk factors  actually
occurs, it could materially  adversely affect our business,  financial condition
or results of operations.  The risks and  uncertainties  described below are not
the only ones which we face. There may be additional risks and uncertainties not
presently  known to us or that we currently  believe are immaterial  which could
also have a negative impact on our business,  financial condition, or results of
operations.

Our future revenues are dependent on corporate licensing relationships

         We generate our revenues  from  corporate  licensing  arrangements.  In
1999, a development partner terminated its relationship  covering the use of our
technology  in  dermatology.  All of our 1998 and 1999  revenues  came  from our
remaining  relationships  with  West  Agro,  Inc.  and  Bausch & Lomb.  They can
terminate their collaboration with us at any time. Since the development program
with Bausch & Lomb has not progressed as quickly as expected,  they might choose
to terminate their relationship with us. If that happens, and we are not able to
enter into new  licensing  relationships,  our revenues for 2000 and beyond will
significantly decrease.

We have no data that IoGen will effectively treat fibrocystic breast disease

         The Phase II  clinical  trial  that we  initiated  in 1998 is the first
trial run on IoGen.  We did not conduct any animal or human  studies to evaluate
the potential  effectiveness  of IoGen before  launching the Phase II trial. Our
decision to invest in the clinical development of IoGen was based on information
we obtained from the scientific literature. That literature indicated that prior
studies utilizing iodine to treat  fibrocystic  breast disease reported clinical
improvement  in over 60% of the patients.  We expect to complete the IoGen Phase
II trial in the  summer  of 2000.  We do not know if the  IoGen  trials  will be
successful.

We lack the resources to conduct the necessary clinical trials required prior to
commercial sales of our potential drugs

         Any drug  candidates  we develop  will require  significant  additional
research and development efforts, including extensive preclinical (animal and in
vitro data) and clinical  testing and regulatory  approval,  prior to commercial

                                       5
<PAGE>

sale.  In addition to IoGen,  our other active drug  development  efforts are in
dermatology  and  ophthalmology.  We have not initiated  our clinical  trials in
dermatology or ophthalmology. Under our arrangement with Bausch & Lomb, they are
financially  responsible for any clinical trials conducted in ophthalmology.  We
must pay for any future clinical trials in women's  healthcare and  dermatology.
Our ability to conduct the necessary  clinical  trials depends on our generating
the  resources  required to pay for this from  future  revenues,  financings  or
licensing relationships.  We may not be able to generate the necessary financial
resources.

We may lose control over development and commercialization of drugs after we
license them

         A key  element  of our  strategy  has been to fund most of our  product
development programs through collaborative  agreements with major pharmaceutical
companies.  As part of these licensing relationships we may have to grant to the
other party control over the development and  commercialization  process.  If we
enter into these  relationships,  we incur risks beyond those related to whether
our  technology  can be  formulated  into  an  acceptable  drug  compound  under
regulatory requirements. These new risks include:

     o        the business priorities of our partner;
     o        the committed resources to the program;
     o        changes in management or ownership of our partner; and
     o        internal competition with other drug candidates of our partner.

         For example, our only existing collaborative agreement is with Bausch &
Lomb. Under that collaboration, Bausch & Lomb is responsible for:

     o        conducting preclinical and clinical trials;
     o        obtaining required regulatory approvals of drug candidates;
     o        manufacturing any resulting products; and
     o        commercializing any resulting products.

         Bausch & Lomb is not  obligated  to develop or  commercialize  any drug
candidates under the collaboration.  Bausch & Lomb alone controls the amount and
timing of resources dedicated by it to the program.  Accordingly,  Bausch & Lomb
controls  development  progress.  Moreover,  Bausch & Lomb may view certain drug
candidates  developed utilizing  Symbollon's  technology as competitive with its
own  drugs  or drug  candidates.  Accordingly,  Bausch & Lomb  may  develop  its
existing or alternative  technologies in preference to the drug candidates based
on our technology.  In addition, Bausch & Lomb may terminate the relationship at
any time.  If they did,  our ability to further  develop an  ophthalmic  product
would be severely hampered without greater resources than we presently have.

         West Agro markets and distributes IodoZyme under an exclusive marketing
and supply  agreement  which covers IodoZyme as well as other products which may
be  developed  for  use  in  dairy  facilities.  IodoZyme's  future  growth  and
profitability  will  depend,  in  large  part,  on the  success  of West  Agro's

                                       6
<PAGE>

personnel and others  conducting  marketing efforts on their behalf in fostering
acceptance of IodoZyme as an alternative to other available products.  West Agro
also  markets and  distributes  products  which are  directly  competitive  with
IodoZyme.

We have had difficulty raising additional funds

         We will require substantial additional funds to run our company.
We need funds for

     o        developing our potential products;
     o        operating the company;
     o        pursuing regulatory clearances; and
     o        protecting our intellectual property rights.

         We intend to seek additional funds through public or private  financing
or collaborative or other arrangements with corporate partners. We have not been
able to enter into a new  corporate  relationship  since 1997.  We believe  that
before we can enter  into any  significant  new  relationships,  we will have to
generate  clinical  results  on  our  potential  drugs.  Our  limited  financial
resources may require us to finance the cost of generating these results. During
1999, we had difficulty raising funds by selling equity. We obtained stockholder
approval to sell up to 1,250,000 shares, with a like number of warrants. We were
only able to sell 836,685 shares and warrants.

         Our common stock  remains  thinly  traded.  There is very little market
support  for our  common  stock.  So  long as  these  conditions  exist,  future
financings  will  continue to be  difficult.  Ultimately,  this could impact the
terms and conditions  upon which we are able to sell securities and raise funds.
If adequate  funds were not available  when needed,  we would be forced to limit
the scope of our development or perhaps cease operations.

We have a history of operating losses that may continue in the future

         We have  incurred a cumulative  operating  loss of  $6,444,769  through
December 31, 1999. Our losses have resulted  principally  from costs incurred in
research and development  activities related to our efforts to develop IodoZyme,
IoGen  and  other  potential  product  formulations,  and  from  the  associated
administrative  and  patent  costs.  We expect to incur  additional  significant
operating  losses over the next several  years and expect  cumulative  losses to
increase  substantially  due to expanded  development  efforts,  preclinical and
clinical trials.  In the next few years, our revenues may be limited to sales of
IodoZyme,  contract research payments and licensing milestone payments under the
Bausch & Lomb agreement (unless terminated) and any amounts received under other
research or development  collaborations that we may establish.  Ultimately,  our
long term profitability is dependent on our ability to

     o     complete the clinical  development  of our product  candidates,
     o     develop and obtain  patent  protection,
     o     obtain  regulatory  approvals  for  our  product candidates,
     o     manufacture  the  resulting  products  and

                                       7
<PAGE>

     o     commercialize  the resulting products.

         Based on the current  status of our  development  efforts,  we will not
receive revenues or royalties from commercial sales for a significant  number of
years,  if at all.  Our  failure  to  receive  significant  revenues  or achieve
profitable operations would impair our ability to sustain operations.

Patent and proprietary rights are difficult to obtain and enforce

         Obtaining and enforcing  patent and  proprietary  rights that cover our
product candidates and processes is essential to our future success.  Because of
the length of time and  considerable  expense  associated with bringing new drug
candidates  through  the  development  and  regulatory  approval  process to the
marketplace,  the pharmaceutical  industry has traditionally placed considerable
importance on obtaining  patent and trade secret  protection for significant new
technologies,  products and processes.  However, legal standards relating to the
validity of patents covering pharmaceutical and biotechnological  inventions and
the scope of claims made under such  patents are still  developing.  There is no
consistent  policy  regarding  the  breadth of claims  allowed in  biotechnology
patents.  The patent position of a biotechnology  firm is uncertain and involves
complex legal and factual questions.

         We  might  not  receive  any   additional   patents   from  the  patent
applications we have filed. Further, any rights we may have under issued patents
might not provide us with significant protection against competitive products or
otherwise be commercially  viable.  Any existing or future patents issued to, or
licensed by, us may subsequently be challenged,  infringed upon,  invalidated or
circumvented by others.  In addition,  patents may have been granted,  or may be
granted,  to others covering  products or processes that are necessary or useful
to the development of our product candidates.  Our development,  manufacture and
sale of product  candidates  could be severely  restricted or prohibited if they
are found to infringe upon the patents, or otherwise  impermissibly  utilize the
intellectual  property,  of others.  In such event, we may be required to obtain
licenses  from third  parties.  We may not be able to obtain  such  licenses  on
acceptable  terms,  or at all.  There  has been  significant  litigation  in the
industry  regarding patents and other proprietary  rights. If we become involved
in litigation  regarding our  intellectual  property rights or the  intellectual
property rights of others, we might incur substantial  litigation costs and have
to pay substantial damages.

         In addition to patent protection, we rely on trade secrets, proprietary
know-how  and  technological  advances  which we seek to  protect,  in part,  by
confidentiality  agreements  with  our  collaborative  partners,  employees  and
consultants.  But these  confidentiality  agreements  might be breached,  and we
might  not have  adequate  remedies  for any such  breach.  Moreover,  our trade
secrets,  proprietary know-how and technological advances might otherwise become
known or be independently discovered by others.

The outcome of clinical drug development cannot be predicted

         Our drug  candidates  will be  subject  to  extensive  preclinical  and
clinical trials to demonstrate their safety and efficacy in humans before we can
obtain  regulatory  approvals  for the  commercial  sale of any of our potential

                                       8
<PAGE>

products.  We are dependent on our  collaborative  partners to conduct  clinical
trials for the drug candidates  covered by our collaborative  agreements and may
become dependent on other third parties to conduct future clinical trials of our
internally  developed  drug  candidates.   Our  only  experience  in  conducting
preclinical or clinical trials is with IoGen.

         We can  not  predict  the  successful  outcome  of our  preclinical  or
clinical trials for our drug candidates. Companies in the biotechnology industry
have  suffered  significant  setbacks in advanced  clinical  trials,  even after
demonstrating  promising  results in earlier  trials.  The failure to adequately
demonstrate the safety and efficacy of a drug candidate under  development could
delay or prevent  regulatory  approval  of the drug  candidate  and would have a
material  adverse  effect  on our  business,  operating  results  and  financial
condition.  Our drug candidates will be subject to the risks of failure inherent
in the development of pharmaceutical  products based on new technologies.  These
risks include the failure

     o        to satisfy applicable regulatory standards for safety and
              effectiveness;
     o        to receive necessary regulatory clearances,
     o        to manufacture the product on a large scale,
     o        to develop into commercially viable products,
     o        to obtain and enforce adequate proprietary protection for such
              product or
     o        to avoid  infringement  of third  party  proprietary  rights when
              marketing such products.

The drug industry is extremely competitive

         The   biotechnology   and   pharmaceutical   industries  are  intensely
competitive  and  subject to rapid and  significant  technological  change.  Our
competitors  in the United States and elsewhere are numerous and include,  among
others, major multinational  pharmaceutical and chemical companies,  specialized
biotechnology  firms and universities and other research  institutions.  Most of
these competitors employ greater financial and other resources, including larger
research and development  staffs and more effective  marketing and manufacturing
organizations,  than we or our collaborative partners. Acquisitions of competing
companies and potential competitors by large pharmaceutical  companies or others
could  enhance  financial,  marketing  and  other  resources  available  to such
competitors.  As a result  of  academic  and  government  institutions  becoming
increasingly  aware of the  commercial  value of their research  findings,  such
institutions are more likely to enter into exclusive  licensing  agreements with
commercial  enterprises,   including  our  competitors,   to  market  commercial
products.  Our competitors may succeed in developing  technologies  and products
that are more  effective  or less costly than any which we develop or which make
our technology and future products obsolete and noncompetitive.

         In  addition,  most  of our  competitors  have  greater  experience  in
conducting   clinical   trials  and  obtaining   United  States  Food  and  Drug
Administration   (commonly   called   FDA)  and  other   regulatory   approvals.
Accordingly,  our competitors  may succeed in obtaining FDA or other  regulatory
approvals for drug  candidates  more rapidly.  Companies that complete  clinical
trials, obtain required regulatory agency approvals and commence commercial sale
of their products before their competitors may achieve a significant competitive
advantage,  including certain patent and FDA marketing  exclusivity  rights that

                                       9
<PAGE>

would delay our ability to market certain products. We are aware of one company,
Mimetix Inc.,  that has conducted human clinical trials in the United States and
Canada  utilizing  an  iodine-based  compound for the  treatment of  fibrocystic
breast disease.  If Mimetix  receives  marketing  approval for its drug compound
before we do,  it could  adversely  affect  our  ability  to  receive  marketing
approval,  or if approved,  our ability to sell our product.  Products resulting
from our technology may not be able to compete  successfully  with  competitors'
existing products or products under development.

Drug development and commercialization is subject to extensive government
regulation

         The FDA and comparable agencies in foreign countries impose substantial
requirements  upon the introduction of  pharmaceutical  products through lengthy
and detailed preclinical,  laboratory and clinical testing procedures,  sampling
activities  and other costly and  time-consuming  procedures to establish  their
safety and efficacy.  All of our product  candidates  will require  governmental
approvals for commercialization, none of which we have obtained. Satisfaction of
these  requirements  typically  take a significant  number of years and can vary
substantially  based  upon the type,  complexity  and  novelty  of the  product.
Government   regulation  also  affects  the   manufacturing   and  marketing  of
pharmaceutical  products.  The effects of government regulation on our potential
products are far-reaching, and include

     o        possible delays in or denials to market them,
     o        costly procedural requirements may be imposed upon our activities,
     o        competitive  advantages may be obtained by companies with greater
              resources or experience,
     o        possible  limitations imposed on the indicated use for which they
              may  be  marketed  and
     o        continual  review  and  periodic  inspection  of the manufacturing
              facilities for them.

The regulatory standards are applied stringently by the FDA and other regulatory
authorities  and failure to comply can,  among  other  things,  result in fines,
denial or  withdrawal  of  regulatory  approvals,  product  recalls or seizures,
operating restrictions and criminal prosecution.

         Teat sanitizers,  although  considered  animal drugs by the FDA, do not
currently  require  clearance by the FDA prior to marketing.  The FDA,  however,
issued draft  guidelines  in 1993  governing  teat dips and no assurance  can be
given that  clearance  by the FDA will not be required  in the future.  Required
compliance with these guidelines or other FDA requirements which may be adopted,
would have a  significant  adverse  effect on the  marketing  of  IodoZyme  and,
consequently, on our results of operations.

         As with many biotechnology and pharmaceutical companies, we are subject
to numerous environmental and safety laws and regulations. Any violation of, and
the cost of compliance with, these regulations could materially adversely affect
our business, operating results and financial condition.


                                       10
<PAGE>


We are dependent on the continued employment of our executive officers

         We are highly  dependent upon the efforts of our senior  management and
scientific  team,  including  the  services  of Dr. Jack H.  Kessler,  the Chief
Executive Officer, Chief Scientific Officer, Secretary and Chairman of the Board
of Directors,  and Paul C. Desjourdy,  the President,  Chief Operating  Officer,
Chief Financial Officer, General Counsel, Treasurer and a director of Symbollon.
Losing  the  services  of one or both of  these  individuals  might  impede  the
achievement  of our  development  objectives  and could have a material  adverse
effect on our  business.  Because of the  specialized  scientific  nature of our
business,  we are  highly  dependent  upon our  ability  to  attract  and retain
qualified scientific and technical personnel.  Major pharmaceutical and chemical
companies,  specialized  biotechnology firms and universities and other research
institutions compete intensely for qualified personnel in our field of activity.
We may not be able to  continue to attract  and retain the  qualified  personnel
necessary  for the  development  of our  business.  Loss of the  services of, or
failure to recruit,  key  scientific  and technical  personnel  could  adversely
affect our business, operating results and financial condition.

We have no marketing experience within our company

         We have granted  marketing  rights to our  collaborative  partners with
respect to products developed based on our technology,  and we intend to rely on
similar  arrangements  with others for the  marketing  and  distribution  of our
products currently under development,  including IoGen, if and when successfully
developed and approved by applicable regulatory agencies. This results, and will
result,  in our  not  having  control  over  some  or all of the  marketing  and
distribution of these  products.  Although we have no present plans to do so, we
may,  in the  future,  determine  to  directly  market  certain of our  proposed
products.  We have no marketing  experience and significant  additional  capital
expenditures  and  management  resources  would be  required to develop a direct
sales  force.  In the event we elect to engage in direct  marketing  activities,
there can be no assurance that we can obtain the requisite  funds or attract and
retain the human  resources  necessary to successfully  market any products.

We have limited manufacturing experience within our company

         IodoZyme  is  currently  produced  through a  combination  of  internal
manufacturing  activities and external contract  manufacturers.  We have granted
manufacturing  rights to Bausch & Lomb with respect to products  developed under
our collaboration, and we intend to rely on similar arrangements with others for
the  manufacturing  of our products  currently  under  development,  if and when
successfully  developed  and approved by  applicable  regulatory  agencies.  Our
dependence on third parties for  manufacturing  may adversely affect our ability
to develop and deliver  products on a timely and  competitive  basis.  If we are
unable to develop or contract for manufacturing on acceptable terms, our ability
to conduct  preclinical  and clinical  trials with our drug  candidates  will be
adversely  affected.  This  could  result in delays  in the  submission  of drug
candidates  for  regulatory  approvals or in the  initiation of new  development
programs, which in turn could materially impair our competitive position and the
possibility of achieving profitability.

                                       11
<PAGE>

         Except for limited experience regarding IodoZyme, we have no experience
with the manufacture of any of our products or proposed  products.  In the event
we continue to perform our current IodoZyme  manufacturing  activities in-house,
additional manufacturing space and equipment may be necessary beyond 1999 if our
product volume increases.  In addition,  if we undertake to directly manufacture
any of our  proposed  products,  we will  be  required  to  attract  and  retain
experienced  personnel to develop a manufacturing  capability and to comply with
extensive government regulations with respect to our facilities, including among
others, the FDA manufacturing  requirements.  We may not be able to successfully
establish appropriate manufacturing operations.

Our proposed drug candidates will be impacted by cost reimbursement and drug
pricing uncertainty

         The  successful  commercialization  of, and the  interest of  potential
collaborative partners to invest in, the development of our drug candidates will
depend substantially on reimbursement of the costs of the resulting products and
related  treatments at acceptable  levels from government  authorities,  private
health   insurers   and  other   organizations,   such  as  health   maintenance
organizations.  Reimbursement  in the  United  States  or  elsewhere  may not be
available for any products we may develop or, if available,  may be decreased in
the  future.  Limited  reimbursement  amounts  may reduce the demand for, or the
price  of,  our  products,   thereby  adversely   affecting  our  business.   If
reimbursement  is not available or is available only to limited  levels,  we may
not  be  able  to  obtain  collaborative   partners  who  will  manufacture  and
commercialize  our  products,  or we may  not be  able to  obtain  a  sufficient
financial  return on our own  manufacture  and  commercialization  of any future
products.

         Third-party payers are increasingly  challenging the prices charged for
medical products and services. Also, the trend toward managed health care in the
United States and the concurrent growth of organizations such as HMOs, which can
control or  significantly  influence  the  purchase of health care  services and
products,  as well as  legislative  proposals  to reform  health  care or reduce
government  insurance  programs,  may result in lower prices for  pharmaceutical
products.   The  cost  containment  measures  that  health  care  providers  are
instituting,  and  the  effect  of any  health  care  reform,  could  materially
adversely  affect  our  ability  to sell  any of our  products  if  successfully
developed  and  approved.  Moreover,  we are unable to predict  what  additional
legislation  or  regulation,  if any,  relating to the health  care  industry or
third-party  coverage  and  reimbursement  may be  enacted in the future or what
effect such legislation or regulation would have on our business.

Drug development and commercialization is subject to potential product liability

         Our business exposes us to potential  liability risks that are inherent
in the testing,  manufacturing and marketing of pharmaceutical products. The use
of our drug  candidates  in clinical  trials may expose us to product  liability
claims and possible adverse  publicity.  These risks will expand with respect to
our drug  candidates,  if any, that receive  regulatory  approval for commercial
sale.  Product liability  insurance for the biotechnology  industry is generally
expensive, if available at all. Such coverage is becoming increasingly expensive
and we may not be able to retain insurance  coverage at acceptable costs or in a

                                       12
<PAGE>

sufficient  amount.  A  product  liability  claim  could  adversely  affect  our
business,  operating results or financial condition.

Our technology has material incompatibility issues

         An important  aspect of our present and future  product  candidates  is
that  they  must be  compatible  with the  surfaces  with  which  they come into
contact.  We have ceased efforts to develop a microbicide for dental  handpieces
and renal control units as a result of staining and corrosion caused by required
microbicide  formulations,  and we have  encountered  problems  of  staining  in
connection  with our efforts to develop a high level  disinfectant  for flexible
endoscopes. We continue to investigate the balance between the level of efficacy
and the  need  to  avoid  staining  and  corrosion.  For  any  proposed  product
applications, staining or corrosion from a product candidate could be sufficient
to limit or  forestall  regulatory  approval or, if  approved,  could  adversely
affect  market  acceptance  of such  product.  We  might  not be  successful  in
overcoming any problems of materials incompatibility.

We use hazardous materials in our development and commercial efforts

         Our manufacturing and development activities involve the controlled use
and shipment of hazardous  chemicals  and other  materials.  Although we believe
that  our  safety  procedures  for  handling,  shipping  and  disposing  of such
materials  comply with the  standards  prescribed  by  federal,  state and local
regulations, we cannot completely eliminate the risk of accidental contamination
or injury from these  materials.  In the event of such an accident,  we could be
held liable for any damages that result and any such liability  could exceed the
our resources. There can be no assurance that current or future environmental or
transportation  laws,  rules,  regulations  or policies will not have a material
adverse effect on us.

We can issue preferred stock without stockholder approval and we have a
classified Board of Directors

         Our Certificate of Incorporation,  as amended,  authorizes the issuance
of 5,000,000  shares of preferred stock on terms which may be fixed by our Board
of Directors  without  further  stockholder  action.  The terms of any series of
preferred stock, which may include priority claims to assets and dividends,  and
special  voting  rights,  could  adversely  affect  the rights of holders of the
common stock.  The issuance of such preferred stock could make a takeover of our
company or the removal of our management more difficult, discourage hostile bids
for control of our company in which  stockholders may receive premiums for their
shares of common  stock,  or  otherwise  dilute  the rights of holders of common
stock and the market price of the common stock. There are no shares of preferred
stock  outstanding.  Although  we have no  current  plans to issue any shares of
preferred stock, there can be no assurance that we will not do so in the future.

         Our Board of  Directors is divided  into three  classes,  with only one
class being  elected each year and each  elected  director to serve three years.
This could discourage efforts to obtain control of our company. It makes it more
difficult  for  stockholders  to  change  the  composition  of  the  Board  in a
relatively  short  period  of  time  since  at  least  two  Annual  Meetings  of
Stockholders will be required to effect a change in the majority of the members.

                                       13
<PAGE>


We are a development stage company with a volatile stock price

         The market  prices for  securities  of emerging and  development  stage
companies  in general,  and  biopharmaceutical  companies  in  particular,  have
historically  been highly volatile.  Future  announcements  concerning us or our
competitors,  including the results of testing, technological innovations or new
commercial products, government regulations, developments concerning proprietary
rights, litigation or public concern as to safety of products developed by us or
others,  may  have a  significant  adverse  impact  on the  market  price of our
securities.  Over the last 12 months our stock  price has ranged  from $14.00 to
$1.75.

         The  volatile  price of our stock makes it difficult  for  investors to
predict the value of their  investment,  to sell shares at a profit at any given
time, or to plan  purchases and sales in advance.

Trading in our stock has been limited, so investors  may not be able to sell as
much  stock as they  want at prevailing prices.

         The average daily trading volume in our common stock was  approximately
16,600 shares and the average daily number of transactions was  approximately 30
over the last three months. If limited trading in our stock continues, it may be
difficult  for  investors to sell their shares in the public market at any given
time at prevailing  prices.

The issuance of additional shares could adversely effect the market price of our
stock

         Warrants  to  purchase  897,675  shares of common  stock and options to
purchase 1,084,895 shares of common stock are currently outstanding.  All of the
warrants and many of the options are  currently  exercisable.  These options and
warrants  are likely to be  exercised  at a time when we might be able to obtain
additional  equity capital on more favorable  terms. We have the right to redeem
the  warrants if the average  closing bid price of our common stock as quoted by
Nasdaq over twenty successive trading day is equal to or greater than:

                    Between                                  Closing Bid Price
                    -------                                  -----------------
         August 10, 1999 to August 9, 2000                          $5.00
         August 10, 2000 to August 9, 2001                          $6.00
         August 10, 2001 to August 9, 2002                          $7.00
         August 10, 2002 to August 9, 2003                          $8.00

         Each of the above  prices is $1 higher if our common  stock is reported
in the over-the-counter market rather than quoted on Nasdaq. On the date of this
prospectus, the exercise price of the warrants is below the market price for the
shares  and we  would be  permitted  to give  notice  of the  redemption  of the
warrants.  A redemption notice would probably cause the warrants to be exercised
and the  underlying  shares of our common stock to be issued at prices below the
then market  price of our common  stock.  While these  options and  warrants are
outstanding,  they may  adversely  affect  the  terms  on which we could  obtain
additional  capital.  If the holders of these  outstanding  options and warrants
sell the common stock  received upon  exercise,  it is likely to have a negative
effect on the market  price of our common  stock,  particularly  in light of the

                                       14
<PAGE>

limited trading volume for our common stock.

         In addition,  we may have to sell more equity  securities in the future
to obtain  operating  funds.  We may sell these  securities at a discount to the
market price. Any future sales of equity  securities will dilute the holdings of
existing stockholders, possibly reducing the value of your investment.

We could be delisted from the Nasdaq SmallCap Market.

         In order to  qualify  for  continued  listing  on the  Nasdaq  SmallCap
Market,  we must,  among  other  things,  have net  tangible  assets of at least
$2,000,000.  At December  31,  1999,  our balance  sheet  showed total assets of
$3,360,579  and  stockholders'  equity  of  $2,673,656.  Since we are  expecting
continuing  losses during 2000, we may not be able to meet the continued listing
criteria of the Nasdaq  SmallCap  Market unless we receive  sufficient  funds to
maintain  our net  tangible  assets.  If our shares of common stock are delisted
from the Nasdaq  SmallCap  Market,  trading,  if any, in the common  stock would
thereafter be conducted in the  over-the-counter  market in the so-called  "pink
sheets" or, if then available, the "OTC Bulletin Board Service." As a result, an
investor  might  find it more  difficult  to dispose  of, or to obtain  accurate
quotations  as to the  value  of,  our  securities.

Our common stock will be adversely effected if it becomes subject to penny stock
rules

         If our common stock is removed from the Nasdaq SmallCap Market,  it may
become  subject to the SEC's "penny stock" rules which impose  additional  sales
practice  requirements  on  broker-dealers  who sell such  securities to persons
other  than  established  customers  and  "accredited   investors"   (generally,
individuals with net worths in excess of $1,000,000 or annual incomes  exceeding
$200,000 or $300,000 together with their spouses).  For transactions  covered by
these rules, a broker-dealer must make a special  suitability  determination for
the  purchase  and  have  received  the  purchaser's   written  consent  to  the
transaction prior to the purchase. Additionally, the rules require delivery of a
risk  disclosure  document  relating to the penny stock market prior to any such
transaction.  Finally,  monthly  statements  are required to be sent  disclosing
recent price information for the penny stock held in the account and information
on the limited market in penny stocks. Consequently, the "penny stock" rules may
affect the ability of broker-dealers to sell our common stock and may affect the
ability  of  purchasers  in this  offering  to sell any of their  shares  in the
secondary market.

We do not anticipate paying dividends

         We have never paid any cash  dividends  on our common  stock and do not
anticipate the payment of cash dividends in the foreseeable future.

Substantial influence of market makers

         There are a limited  number of market  makers  which  currently  make a
market in our common stock and our common stock is thinly traded.  Consequently,
these  market  makers  may exert a  dominating  influence  on the market for our
common stock. Such  market-making  activity may be discontinued at any time. The
price and  liquidity  of our common stock may be  significantly  affected by the
degree of any current market maker's participation in the market.

                                       15
<PAGE>

                                 USE OF PROCEEDS

            All of the common stock covered by this  prospectus is being sold by
the selling  stockholders.  We will not receive any of the  proceeds  from those
sales.

            If all of the 897,675  warrants  whose  underlying  shares are being
registered  for resale are exercised at their current $3.00 exercise  price,  we
will receive net proceeds from such exercise of  approximately  $2,693,000.  The
exercise price increases by $1.00 annually,  up to $6.00.  The proceeds from the
exercise  of the  warrants  would used for  working  capital  and other  general
corporate purposes.

                              SELLING STOCKHOLDERS

            This prospectus covers offers and sales by the selling  stockholders
of the shares of our common stock,  including  shares  issuable upon exercise of
warrants, issued in our 1999 private placement.

            In the private placement,  we offered to accredited investors units,
at a price of $1.75 per unit,  consisting  of one share of common  stock and one
warrant.  Each warrant is exercisable for a four year period expiring August 10,
2003 to  purchase  one share of common  stock at an exercise  price  (subject to
adjustment) of $3.00 during the first year,  $4.00 during the second year, $5.00
during the third  year and $6.00  during  the  fourth  year.  We sold a total of
836,685 units.  In addition,  pursuant to our obligation to the placement  agent
for the  offering,  Indianapolis  Securities,  Inc.,  we issued an  aggregate of
60,990 warrants (some of which warrants were  transferred by the placement agent
to certain of its  employees).  These  warrants  were issued as a portion of the
placement  agent's  compensation,   in  addition  to  paying  $106,733  (in  the
aggregate) as a 10% cash commission to the placement agent for units sold by it.

            The table below lists the selling stockholders,  shows the shares of
common stock beneficially owned by each of the selling  stockholders as of March
31, 2000 and the shares offered for resale by each of the selling  stockholders.
Beneficial  ownership includes shares which the selling stockholders can acquire
upon  exercise of the warrants (all of which are  currently  exercisable)  or of
options  exercisable  currently  or within 60 days  after  March 31,  2000.  Our
registration  of  these  shares  does not  necessarily  mean  that  any  selling
stockholder  will sell all or any of its shares of common stock. The "Beneficial
Ownership After Offering" columns in the table assume that all shares covered by
this prospectus will be sold by the selling  stockholders and that no additional
shares of common stock are bought or sold by any selling stockholder. Except for
Indianapolis  Securities,  Inc.,  or as  noted  in  the  footnotes,  no  selling
stockholder has had, within the past three years, any position,  office or other
material relationships with us.

            The  information  provided  in the table  below is from the  selling
stockholders,  reports  furnished  to us under  rules of the SEC,  and our stock
ownership records.

                                       16
<PAGE>

<TABLE>
<CAPTION>
                                                                                                          Beneficial
                                             Beneficial Ownership Prior to Offering                     Ownership After
                                                                                                           Offering
                                       ---------------------------------------------------             ------------------
                                                                                             Total
                                                       Shares     Total Shares   % of      Number of
                                                     Underlying     Ownership    Total       Shares
     Name of Selling Stockholder       Shares (1)     Warrants                    Shares    Offered     Shares      %
- -------------------------------------- ------------ ------------- -------------- --------- ----------- ---------- -------
<S>                                        <C>           <C>            <C>         <C>       <C>        <C>        <C>
Richard M. & Tina D. Lilly (2)             286,110        75,110        361,220      9.6%      97,210    264,010    7.1%
Mary Beth Cooney                             6,700         6,700         13,400         *      13,400        -0-       *
Ferdie A. & Ursula M. Falk                   6,000         6,000         12,000         *      12,000        -0-       *
KG Associates                               26,000        26,000         52,000      1.4%      52,000        -0-       *
Charles R. Behrmann                         13,600        10,000         23,600         *      20,000      3,600       *
Richard P. Morgenstern (3)                 127,500       127,500        255,000      6.7%     255,000        -0-       *
Alan S. Morgenstern 1994 Trust              45,000        45,000         90,000      2.4%      90,000        -0-       *
Carol E. Morgenstern (4)                    90,000        90,000        180,000      4.9%     180,000        -0-       *
Pure Holdings, LP                           30,000        30,000         60,000      1.6%      60,000        -0-       *
Star Investments, LP                        30,000        30,000         60,000      1.6%      60,000        -0-       *
Paul and Carol McHugh Cole                  26,000        26,000         52,000      1.4%      52,000        -0-       *
Eugene Lieberstein (5)                      35,016        15,000         50,016      1.3%      30,000     20,016       *
Norman Alpert (6)                            7,500         7,500         15,000         *      15,000        -0-       *
Edward Klimerman and Janet C. Walden
(7)                                          2,500         2,500          5,000         *       5,000        -0-       *
Thomas L. Hansberger                        20,000        20,000         40,000      1.1%      40,000        -0-       *
Judith W. Schrafft                           4,000         4,000          8,000         *       8,000        -0-       *
Robert Kiken                                10,000        10,000         20,000         *      20,000        -0-       *
Kenneth M. Kiken                            22,000        10,000         32,000         *      20,000     12,000       *
Norman P. Kiken                             10,000        10,000         20,000         *      20,000        -0-       *
Assaf Family Trust                          14,000        14,000         28,000         *      28,000        -0-       *
Warren M. Knight                            25,000         4,000         29,000         *       8,000     21,000       *
Russell R. Desjourdy (8)                    20,000        20,000         40,000      1.1%      40,000        -0-       *
Gopen Family Trust                          50,000        50,000        100,000      2.7%     100,000        -0-       *
Brett P. & Mary Sheila Smith                17,500        17,500         35,000         *      35,000        -0-       *
Matthew A. Frinzi                           10,000        10,000         20,000         *      20,000        -0-       *
Jan McArt                                   20,200        20,200         40,400      1.1%      40,400        -0-       *
Paul C. Desjourdy (9)                      288,054        10,000        298,054      7.6%      20,000    278,054    7.1%
Peter K. and Jill Boli                      19,885        14,285         34,170         *      28,570      5,600       *
Eileen Botfeld                               5,000         5,000         10,000         *      10,000        -0-       *
Jane A. & Barron G. Postmus                 10,000        10,000         20,000         *      20,000        -0-       *
Western Investment Corporation              50,000        15,000         65,000      1.8%      30,000     35,000       *
Merrick Management Corporation              15,000        15,000         30,000         *      30,000        -0-       *
Tony and Carmen Chamoun                      5,000         5,000         10,000         *      10,000        -0-       *
George Kottler                               9,000         9,000         18,000         *      18,000        -0-       *
Stanley and Lesley Berkovitz                10,000        10,000         20,000         *      20,000        -0-       *
Edwin W. and Ellen A. Harley                 3,000         3,000          6,000         *       6,000        -0-       *
Carl J. Domino                              20,000        20,000         40,000      1.1%      40,000        -0-       *
Ronald C. & Pamela A. Retterath              3,000         3,000          6,000         *       6,000        -0-       *
Ronald L. and Sheila L. Miller              20,000        20,000         40,000      1.1%      40,000        -0-       *
Robert B. Forsyth                            3,400         3,400          6,800         *       6,800        -0-       *
Herbert J. Stangl Trust                     10,000        10,000         20,000         *      20,000        -0-       *
Roger D. Bensen                             68,800        50,000        118,800      3.2%     100,000     18,800       *
Indianapolis Securities, Inc. (10)             -0-        14,748         14,748         *      14,748        -0-       *
Ian G. Walker (11)                             -0-         6,480          6,480         *       6,480        -0-       *
Ann Greene (11)                                -0-         1,500          1,500         *       1,500        -0-       *
- ---------------------------------------------------------------
</TABLE>
*        Less than 1% of the common stock outstanding.
(1)      Exclusive of shares underlying warrants.

                                       17
<PAGE>

(2)      Includes shares owned by Mr. Lilly's revocable trust dated December 1,
         1989 and includes 10,000 shares owned by his children.  Also, includes
         38,262 placement agent warrants transferred to Mr. and Mrs. Lilly by
         Indianapolis Securities, Inc. and another 14,748 placement agent
         warrants owned by Indianapolis Securities, Inc., which Mr. Lilly may be
         considered to beneficially own.  As described in the "Selling
         Stockholders" section, Indianapolis Securities, Inc. was placement
         agent for our 1999 private placement and received warrants as part of
         its compensation.
(3)      Includes shares owned by Mr. Morgenstern's living trust and includes
         67,500 shares of common stock and 67,500 warrants owned by Mr.
         Morgenstern's children.
(4)      Includes 45,000 shares of common stock and 45,000 warrants owned by Ms.
         Morgenstern's children.
(5)      Mr. Lieberstein is a Symbollon director and provides legal services to
         us.  Includes currently exercisable options to
         purchase 7,916 shares of common stock.
(6)      Mr. Alpert is a member of RubinBaum LLP, which provides legal services
         to us.
(7)      Mr. Klimerman is a member of RubinBaum LLP, which provides legal
         services to us.
(8)      Russell Desjourdy is the brother of our President, Paul C. Desjourdy.
(9)      Mr. Desjourdy is our President, Chief Operating Officer, Chief
         Financial Officer, General Counsel and Treasurer, and he is also a
         Symbollon director.  Includes currently exercisable options to purchase
         232,854 shares of common stock.
(10)     See note 1.
(11)     Employee of Indianapolis Securities, Inc. and transferee of a portion
         of its placement agent warrants.

                              PLAN OF DISTRIBUTION

         We are  registering the common stock covered by this prospectus for the
selling  stockholders  pursuant to a  registration  right granted to the selling
stockholders.  The  selling  stockholders  have  indicated  that they are acting
independently  from us in  determining  the  manner  and  extent of sales of the
shares of our common stock. These shares may be sold or distributed from time to
time by the selling stockholders,  by their donees,  pledgees and transferees or
by their other  successors  in  interest.  Such sales may be made in one or more
types  of   transactions   (which  may  include  block   transactions)   in  the
over-the-counter market, in negotiated transactions, through put or call options
transactions  relating to the  shares,  through  short sales of shares,  hedging
transaction,  or a  combination  of such  methods  of  sale,  at  market  prices
prevailing at the time of sale, or at negotiated  prices.  Such transactions may
or may not involve brokers or dealers.  Sales of shares in the  over-the-counter
market  involving  brokers  or  dealers  may be by  means  of one or more of the
following transactions:

         o        in a block trade in which a broker or dealer  will  attempt to
                  sell the shares as agent but may position and resell a portion
                  of the block as principal to facilitate the transaction;

         o        in transactions in which brokers, dealers or underwriters
                  purchase the shares as principal and resell the shares for
                  their own accounts pursuant to this prospectus; and

         o        in ordinary brokers' transactions and transactions in which
                  the broker solicits purchasers.

         The  selling  stockholders  have  advised  us that  they  have  made no
arrangements or agreements with any  underwriters,  brokers or dealers regarding
the resale of the common stock prior to the effective  date of this  prospectus.
The selling  stockholders  may pay commissions or allow discounts to any brokers
or dealers participating in the resale of the common stock, which commissions or
discounts may be less than or in excess of the  customary  rates of such brokers

                                       18
<PAGE>

or dealers for similar transactions.

         We have agreed to pay the fees and expenses of  registering  the common
stock,  including the reasonable fees and  disbursements  of persons retained by
us;  however,  we will not pay the  commissions  and discounts of  underwriters,
dealers or agents.

         The selling  stockholders also may sell these shares in accordance with
Rule 144 under the Securities Act of 1933.

         The  participating selling stockholders and any underwriters,  brokers
or dealers engaged by them may be deemed underwriters, and any profits on  sales
of the  common  stock  by them  and any  discounts, commissions or concessions
received by any selling  stockholder or underwriter, broker or dealer may be
deemed to be underwriting discounts or commissions under the Securities Act of
1933.

         If the selling stockholder  notifies us that a material arrangement has
been  entered  into with an  underwriter,  broker or dealer  for the sale of the
common stock through a secondary  distribution  or a purchase by an underwriter,
broker  or  dealer,  a  supplemented  prospectus  will be  filed,  if  required,
disclosing such of the following information as we believe is appropriate:

     o   the name of each such selling  stockholder  and of the  participating
         underwriter,  broker or dealer;
     o   the number of shares of common stock involved;
     o   the price at which  such  common  stock  was  sold;
     o   the commissions paid or discounts or concessions   allowed  to  such
         underwriter,  broker or dealer;
     o   where applicable, that such broker or dealer did not conduct any
         investigation to verify the information set out or incorporated by
         reference in the prospectus; and
     o   other facts material to the transaction.

         We have agreed to indemnify the selling  stockholders  against  certain
liabilities  relating to resale of the common stock under the  Securities Act of
1933.  Each of the  selling  stockholders  has agreed to  indemnify  us (and our
officers and directors and any person that controls us) against such liabilities
to the extent resulting from untrue statements or omissions in the prospectus or
registration  statement  based on written  information  furnished by the selling
stockholder   specifically   for  use  in  preparing  this   prospectus  or  the
registration  statement.  The selling  stockholders  may agree to indemnify  any
agent, dealer or broker-dealer that participates in transactions involving sales
of the shares against certain liabilities,  including  liabilities arising under
the Securities Act of 1933. Insofar as indemnification for liabilities under the
Securities Act of 1933 may be permitted to our directors or officers, or persons
that  control  us, we have been  informed  that in the  opinion  of the SEC such
indemnification  is against  public policy as expressed in the Securities Act of
1933 and is therefore unenforceable.

         Although all of the shares are being  registered  for public sale,  the
sale of any or all of such shares by the selling  stockholders may depend on the

                                       19
<PAGE>

sale price of such  shares and market  conditions  generally  prevailing  at the
time.  We are  unable to  predict  the effect  which  sales of the common  stock
offered hereby might have upon our ability to raise further capital.

         Because selling stockholders may be deemed to be "underwriters"  within
the meaning of the  Securities  Act of 1933,  the selling  stockholders  will be
subject to the prospectus delivery requirement of the Securities Act of 1933 and
the rules promulgated thereunder. We have informed the selling stockholders that
the  anti-manipulative  provisions of Regulation M under the Securities Exchange
Act of 1934 may apply to their sales in the market.

            In  order  to  comply  with  certain  states'  securities  laws,  if
applicable,  the  common  stock  will be  sold  in  these  states  only  through
registered or licensed brokers or dealers.  In addition,  in certain states, the
shares  of common  stock may not be sold  unless  they have been  registered  or
qualified  for  sale  in  such  states  or an  exemption  from  registration  or
qualification is available and complied with.

                                  LEGAL MATTERS

            For purpose of this offering,  RubinBaum LLP, New York, New York, is
giving  an  opinion  on the  validity  of  the  common  stock  offered  by  this
prospectus.  Messrs.  Alpert and Klimerman are members of RubinBaum LLP and also
are selling stockholders hereunder.
See "Selling Stockholders."

                                     EXPERTS

            The  financial   statements   incorporated   by  reference  in  this
prospectus have been audited by BDO Seidman,  LLP, independent  certified public
accountants,  to the  extent  and for the  periods  set  forth in  their  report
incorporated  herein by reference,  and are incorporated herein in reliance upon
such report  given upon the  authority  of said firm as experts in auditing  and
accounting.

                                       20
<PAGE>










                              SYMBOLLON CORPORATION

                    1,734,630 SHARES OF CLASS A COMMON STOCK

                                   PROSPECTUS

                                 _________, 2000


<PAGE>



                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.    Other Expenses of Issuance and Distribution.

            The following  table sets forth the costs and  expenses,  other than
any underwriting discounts and commissions,  payable in connection with the sale
of the common stock being  registered.  All amounts are estimates except the SEC
registration fee.

            SEC Registration and filing fee                            $  2,727
            Printing fees                                                 1,000
            Accounting fees and expenses                                  1,500
            Legal fees and expenses                                       4,000
            Miscellaneous                                                   773
                                                                     ----------
            Total                                                       $10,000
                                                                        =======

Item 15.    Indemnification of Directors and Officers.

         Reference  is made to Section 145 of the Delaware  General  Corporation
Law  (the  "DGCL"),   Article   TENTH  of  the   Registrant's   Certificate   of
Incorporation,  as  amended  (Exhibit  3.1),  Article  VIII of the  Registrant's
By-Laws,  as amended (Exhibit 3.2) and the  Indemnification  Agreements  entered
into with certain of the Registrant's directors and officers (Exhibit 10.5).

         Section  145 of the  DGCL  generally  provides  that a  corporation  is
empowered to indemnify  any person who was or is a party or is  threatened to be
made a party to any threatened,  pending or completed action, suit or proceeding
by reason of the fact that he is or was a director,  officer,  employee or agent
of the corporation or is or was serving,  at the request of the corporation,  in
any of such capacities  with another  corporation or other  enterprise,  if such
director,  officer,  employee  or agent  acted in good  faith and in a manner he
reasonably  believed in or not opposed to the best interests of the corporation,
and with, respect to any criminal action or proceeding,  had no reasonable cause
to believe his conduct was  unlawful.  In the case of an action or suit by or in
the right of the corporation,  no indemnification  shall be made with respect to
any claim,  issue or matter as to which such person shall have been  adjudged to
be liable to the corporation unless and only to the extent that the court having
jurisdiction shall determine that such person is fairly and reasonably  entitled
to indemnity.  This statute  describes in detail the right of the  Registrant to
indemnify any such person.

         Pursuant  to  Article  NINTH  of  the   Registrant's   Certificate   of
Incorporation and Article VIII of the Registrant's By-Laws, the Registrant shall
indemnify,  to the fullest extent  permitted by the DGCL, any person,  including
officers and directors, with regard to any action or proceeding.

         The Registrant has entered into an  indemnification  agreement with its
directors  and  officers.  Such  agreement  provides  that the  Registrant  will
indemnify the  indemnitee  to the fullest  extent  permitted by  applicable  law
against expenses,  including reasonable attorneys' fees,  judgments,  penalties,

                                      II-1
<PAGE>

fines and amounts paid in settlement  actually and reasonably incurred by him in
connection  with any  civil or  criminal  action  or  administrative  proceeding
arising  out of his  performance  of his duties as a director  or officer of the
Registrant  other  than an action  initiated  by a  director  or  officer.  Such
indemnification  is  available  if the  indemnitee  acted in good faith and in a
manner he reasonably believed to be in, or not opposed to, the best interests of
the Registrant, and with respect to any criminal action, had no reasonable cause
to believe his conduct was unlawful.

         Under such indemnification  agreement, the entitlement of a director or
officer to  indemnification  is  determined  by a  majority  vote of a quorum of
disinterested  directors,  or if such  quorum  either  is not  obtainable  or so
directs,  by independent  counsel or by the  stockholders or the Registrant,  as
determined   by  such  quorum  of   disinterested   directors.   Under   certain
circumstances, a party to the indemnification agreement is conclusively presumed
to have met the applicable statutory standard of conduct unless the Registrant's
Board of Directors, stockholders or independent legal counsel determine that the
relevant standard has not been met. If a change of control of the Registrant has
occurred,  the  entitlement  of such director or officer to  indemnification  is
determined by independent  counsel selected by such director or officer,  unless
such  director or officer  requests  that either the Board of  Directors  or the
stockholders make such determination.

         The  Registrant  currently  has  Director  and  Officer
liability  insurance  which  covers,  among other  things,  certain  liabilities
arising under the Securities Act.

         The  agreement  with the  selling  stockholders  pursuant to which this
Registration  Statement is being filed  provided  that each selling  stockholder
will indemnify and hold harmless the Registrant,  its directors and officers and
any controlling  person of the Registrant  from and against,  and will reimburse
the Registrant, its directors and officers, and any such controlling person with
respect to, any and all loss,  damage,  liability,  cost or expense to which the
Registrant  or any  controlling  person  may  become  subject  under  the Act or
otherwise, insofar as such losses, damages,  liabilities,  costs or expenses are
caused by any untrue  statement or alleged untrue statement of any material fact
contained in such registration  statement,  any prospectus  contained therein or
any  amendment  or  supplement  thereto,  or arise out of or are based  upon the
omission or alleged  omission to state  therein a material  fact  required to be
stated  therein or necessary  to make the  statements  therein,  in light of the
circumstances  in which  they were  made,  not  misleading,  in each case to the
extent,  but only to the extent,  that such untrue  statement or alleged  untrue
statement or omission or alleged  omission  was so made in reliance  upon and in
strict  conformity  with written  information  furnished by or on behalf of such
selling stockholders specifically for use in the preparation thereof.

         Insofar as indemnification for liabilities arising under the Securities
Act  may  be  permitted  to  directors,  officers  or  persons  controlling  the
Registrant  pursuant  to the  foregoing  provisions,  the  Registrant  has  been
informed that in the opinion of the Commission such  indemnification  is against
public  policy  as  expressed  in  the   Securities   Act  and  is,   therefore,
unenforceable. See Item 17. "Undertakings."

                                      II-2
<PAGE>
Item 16.    Exhibits

            (a) Exhibit

Number      Description

3.1      Amended Certificate of Incorporation of the Company;  including
         Certificate of Designations,  Preferences and Rights of Series
         A Preferred  Stock of the  Company.  (previously  filed as exhibit 3.1
         to Form 10-QSB for the quarter  ended June 30, 1999 and
         incorporated by reference.)

3.2      Amended By-Laws of the Company. (previously filed as exhibit 3.2 to
         Form 10-QSB for the quarter ended June 30, 1999 and incorporated by
         reference.)

3.3      Agreement  of Merger,  dated as of August 4, 1993,  between the Company
         and  Symbollon  Corporation,  a  Massachusetts  corporation  (including
         Certificate of Merger and other state  filings).  (previously  filed as
         exhibit number 3.3 of the  Registration  Statement  (the  "Registration
         Statement") on Form SB-2  (Registration No. 33-68828) filed on November
         24, 1993 and declared  effective on December 7, 1993, and  incorporated
         by reference.)

4.1      Form of Specimen Class A Common Stock Certificate. (previously filed as
         exhibit number 4.2 of the Registration  Statement and
         incorporated by reference.)

4.2      Form of Stock  Restriction  Agreement among the Company,  the Class B
         Stockholders and the Underwriter. (previously  filed as exhibit number
         4.4 of the Registration Statement and incorporated by reference.)

5.1      Opinion by RubinBaum LLP *

10.1     1993 Stock Option Plan of the Company, as amended. (previously filed as
         exhibit 10.1 to Form 10-QSB for the quarter  ended
         June 30, 1999 and incorporated by reference.)

10.2     Employment Agreement, dated December 14, 1999, between the Company and
         Paul C. Desjourdy. (previously filed as exhibit number 10.2 to Form
         10-KSB for the year ended December 31, 1999 and incorporated by
         reference.)

10.3     Employment Agreement,  dated December 14, 1999, between the Company and
         Dr. Jack H. Kessler  (previously  filed as exhibit  number 10.3 to Form
         10-KSB  for the  year  ended  December  31,  1999 and  incorporated  by
         reference.)

10.4     Commercial Lease dated June 5, 1997, between Pine Street Realty Trust
         and the Company. (previously filed as exhibit number 10.18 to Form
         10-QSB for the quarter ended June 30, 1997 and incorporated by
         reference.)

10.5     Form of Indemnification Agreement between the Company and each officer
         and director of the  Company. (previously  filed as exhibit number 10.6
         of the Registration Statement and incorporated by reference.)

10.6     Marketing and Supply Agreement, dated January 11, 1995 between the
         Company and West Agro. (previously filed as exhibit number 10.1 to Form
         8-K of the  Registrant  dated  January  11,  1995 and  incorporated  by
         reference). **

10.7     Agreement, dated August 31, 1992 among the Company, Dr. Jack H. Kessler
         and Dr. Robert Rosenbaum. (previously  filed as exhibit number
         10.8 of the Registration Statement and incorporated by reference.)

10.8     Form of Stock Option Agreement to be entered into between the Company
         and each option  holder.  (previously  filed as exhibit number 10.10 to
         Form 10-KSB for the year ended  December 31, 1993 and  incorporated  by
         reference.)

10.9     1994 Employee Stock Purchase Plan of the Company. (incorporated  by
         reference to Exhibit B to the Company's 1994 Annual Stockholders
         Meeting Proxy Statement filed under cover of Schedule 14A dated
         May 4, 1994.)

10.10    1995  Non-Employee  Directors' Stock Option Plan of the Company.
         (previously  filed as exhibit number 10.1 to Form 10-QSB for
         the quarter ended June 30, 1995 and incorporated by reference.)

10.11    Collaboration and Sale/License Agreement, dated August 4, 1997, between
         the Company and Bausch & Lomb Pharmaceuticals, Inc. (previously filed
         as exhibit number 10.19 to Form 10-QSB for the quarter ended June 30,
         1997 and incorporated by reference.) **

10.12    Stock Purchase Agreement, dated August 4, 1997, between the Company and
         Bausch & Lomb Pharmaceuticals, Inc. (previously filed as exhibit number
         10.20  to  Form  10-QSB  for  the  quarter  ended  June  30,  1997  and
         incorporated by reference.)

                                      II-3
<PAGE>

10.13    Form of Subscription  Agreement,  dated as of August 10, 1999,  between
         the Company and the  purchasers of Units  (previously  filed as exhibit
         number 10.14 to Form 10-QSB for the quarter  ended  September  30, 1999
         and incorporated by reference.)
10.14    Form of Redeemable Warrant for the purchase of shares of Class A Common
         Stock,  dated as of August  10,  1999,  issued to  purchasers  of Units
         (previously  filed  as  exhibit  number  10.15 to Form  10-QSB  for the
         quarter ended September 30, 1999 and incorporated by reference.)

23.1     Consent by BDO Seidman, LLP *

23.3     Consent by RubinBaum LLP (included in Exhibit 5.1) *

24.1     Power of Attorney (included on the signature page of this registration
         statement) *
- --------------------------------------------------------------------------------

*        Filed herewith.
** Indicates that material has been omitted and confidential  treatment has been
granted  or  requested  therefor.  All such  omitted  material  has  been  filed
separately with the Commission pursuant to Rule 24b-2.


Item 17.    Undertakings.

            The registrant will:

            (1) File,  during any period in which it offers or sells securities,
a post-effective amendment to this registration statement to:

                   (i)  Include any prospectus required by section 10(a)(3) of
the Securities Act;

                   (ii)  Reflect in the prospectus any facts or events
which, individually or in the aggregate, represent a
fundamental  change in the information set forth in the registration  statement.
Notwithstanding the foregoing,  any increase or decrease in volume of securities
offered (if the total dollar value of  securities  offered would not exceed that
which  was  registered)  and any  deviation  from  the  low or  high  end of the
estimated  maximum  offering  range may be reflected  in the form of  prospectus
filed with the  Commission  pursuant  to Rule 424(b) if, in the  aggregate,  the
changes in volume and price  represent  no more than a 20 percent  change in the
maximum  aggregate  offering price set forth in the "Calculation of Registration
Fee" table in the effective registration statement;

                   (iii)  Include any additional or changed material information
 on the plan of distribution;

provided,  however,  that  paragraphs  (1)(i) and (1)(ii)  will not apply if the
information  required  to be  included in a  post-effective  amendment  by those
paragraphs  is  contained  in periodic  reports  filed with or  furnished to the
Commission  by the  registrant  pursuant  to Section 13 or Section  15(d) of the
Securities  Exchange  Act of 1934  that are  incorporated  by  reference  in the
registration statement.

            (2) For  determining  liability under the Securities Act, treat each
post-effective  amendment  as a new  registration  statement  of the  securities
offered, and the offering of such securities at that time to be the initial bona
fide offering thereof.

                                      II-4
<PAGE>

            (3) File a post-effective  amendment to remove from registration any
of the securities that remain unsold at the end of the offering.

            The undersigned  registrant  hereby undertakes that, for purposes of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
registrant's  annual  report  pursuant to Section 13(a) or 15(d) of the Exchange
Act (and,  where  applicable,  each filing of an employee  benefit plan's annual
report  pursuant to Section 15(d) of the Exchange Act) that is  incorporated  by
reference in the registration statement shall be deemed to be a new registration
statement relating to the securities  offered therein,  and the offering of such
securities  at that  time  shall be  deemed to the  initial  bona fide  offering
thereof.

            Insofar  as  indemnification   for  liabilities  arising  under  the
Securities  Act of 1933 (the "Act") may be permitted to directors,  officers and
controlling persons of the registrant pursuant to the foregoing  provisions,  or
otherwise,  the registrant  small  business  issuer has been advised that in the
opinion of the  Securities  and  Exchange  Commission  such  indemnification  is
against  public  policy  as  expressed  in the  Securities  Act of 1933  and is,
therefore,  unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant small business issuer
of expenses incurred or paid by a director, officer or controlling person of the
registrant small business issuer in the successful  defense of any action,  suit
of proceeding) is asserted by such  director,  officer or controlling  person in
connection with the securities being  registered,  the registrant small business
issuer will, unless in the opinion of its counsel the matter has been settled by
controlling  precedent,  submit  to a  court  of  appropriate  jurisdiction  the
question  whether  such  indemnification  by  it is  against  public  policy  as
expressed  in the Act and will be  governed  by the final  adjudication  of such
issue.

                                      II-5
<PAGE>


                                   SIGNATURES

            Pursuant to the  requirements  of the  Securities  Act of 1933,  the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Framingham,  Commonwealth of Massachusetts,  on April
24, 2000.

                                                SYMBOLLON CORPORATION

                                                By  /s/ Paul C. Desjourdy
                                                   -----------------------------
                                                   Paul C. Desjourdy, President

         KNOW  ALL MEN BY THESE  PRESENTS,  that  each  person  whose  signature
appears below hereby  severally  constitutes  and appoints Paul C. Desjourdy and
Jack H.  Kessler  and each of them,  his true and lawful  attorneys-in-fact  and
agents,  each acting alone, with full power of substitution and  resubstitution,
for him and in his name, place and stead, in any and all capacities, to sign any
and all amendments  (including  post-effective  amendments) to this Registration
Statement on Form S-3 and all documents relating thereto,  and to file the same,
with all exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents,  each acting  alone full power and  authority to do and perform each and
every act and thing necessary or advisable to be done in and about the premises,
as fully to all intents and  purposes as he might or could do in person,  hereby
ratifying and  confirming  all that said  attorneys-in-fact  and agents,  or his
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

            Pursuant to the  requirements  of the Securities  Act of 1933,  this
registration  statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated:

     Signature                      Title                             Date

/s/ Jack H. Kessler          Chief Executive Officer,            April 24, 2000
- --------------------------   Chief Scientific Officer,
   Jack H. Kessler           Secretary and Chairman
                             of the Board of Directors
                             (Principal Executive Officer)

/s/ Paul C. Desjourdy        President, Chief Operating Officer, April 24, 2000
- --------------------------   Treasurer, General Counsel, Chief
   Paul C. Desjourdy         Financial Officer, and Director (Principal
                             Financial and Accounting Officer)


/s/ James C. Richards        Director                            April 24, 2000
- --------------------------
   James C. Richards

/s/ Richard F. Maradie        Director                           April 24, 2000
- --------------------------
  Richard F. Maradie

/s/ Eugene Lieberstein        Director                           April 24, 2000
- --------------------------
   Eugene Lieberstein

                                      II-6
<PAGE>
                                INDEX TO EXHIBITS

3.1      Amended Certificate of Incorporation of the Company;  including
         Certificate of Designations,  Preferences and Rights of Series
         A Preferred  Stock of the  Company.  (previously  filed as exhibit 3.1
         to Form 10-QSB for the quarter  ended June 30, 1999 and
         incorporated by reference.)
3.2      Amended  By-Laws of the  Company.  (previously  filed as exhibit 3.2 to
         Form  10-QSB for the  quarter  ended June 30, 1999 and
         incorporated by reference.)
3.3      Agreement  of Merger,  dated as of August 4, 1993,  between the Company
         and  Symbollon  Corporation,  a  Massachusetts  corporation  (including
         Certificate of Merger and other state  filings).  (previously  filed as
         exhibit number 3.3 of the  Registration  Statement  (the  "Registration
         Statement") on Form SB-2  (Registration No. 33-68828) filed on November
         24, 1993 and declared  effective on December 7, 1993, and  incorporated
         by reference.)
4.1      Form of Specimen Class A Common Stock Certificate.  (previously filed
         as exhibit number 4.2 of the Registration  Statement and
         incorporated by reference.)
4.2      Form of Stock Restriction Agreement among the Company, the Class B
         Stockholders and the Underwriter. (previously filed as exhibit number
         4.4 of the Registration Statement and incorporated by reference.)
5.1      Opinion by RubinBaum LLP. *
10.1     1993 Stock  Option Plan of the Company,  as amended. (previously  filed
         as exhibit 10.1 to Form 10-QSB for the quarter  ended
         June 30, 1999 and incorporated by reference.)
10.2     Employment Agreement, dated December 14, 1999, between the Company and
         Paul C. Desjourdy. (previously filed as exhibit number 10.2 to Form
         10-KSB for the year ended December 31, 1999 and incorporated by
         reference.)
10.3     Employment  Agreement,  dated  December 14, 1999,  between the Company
         and Dr. Jack H. Kessler.  (previously  filed as exhibit
         number 10.3 to Form 10-KSB for the year ended December 31, 1999 and
         incorporated by reference.)
10.4     Commercial  Lease dated June 5, 1997,  between Pine Street Realty Trust
         and the Company. (previously filed as exhibit number 10.18 to Form
         10-QSB for the quarter ended June 30, 1997 and
         incorporated by reference.)
10.5     Form of  Indemnification  Agreement  between the Company and each
         officer and director of the  Company.  (previously  filed as exhibit
         number 10.6 of the Registration Statement and incorporated by
         reference.)
10.6     Marketing  and Supply  Agreement,  dated  January 11, 1995  between the
         Company and West Agro. (previously filed as exhibit number 10.1 to Form
         8-K of the  Registrant  dated  January  11,  1995 and  incorporated  by
         reference). **
10.7     Agreement, dated August 31, 1992 among the Company, Dr. Jack H. Kessler
         and Dr. Robert Rosenbaum. (previously filed as exhibit number 10.8 of
         the Registration Statement and incorporated by reference.)
10.8     Form of Stock  Option  Agreement to be entered into between the Company
         and each option  holder.  (previously  filed as exhibit number 10.10 to
         Form 10-KSB for the year ended  December 31, 1993 and  incorporated  by
         reference.)
10.9     1994 Employee Stock Purchase Plan of the Company.  (incorporated by
         reference to Exhibit B to the Company's 1994 Annual Stockholders
         Meeting Proxy Statement filed under cover of Schedule 14A
         dated May 4, 1994.)
10.10    1995  Non-Employee  Directors' Stock Option Plan of the Company.
         (previously  filed as exhibit number 10.1 to Form 10-QSB for
         the quarter ended June 30, 1995 and incorporated by reference.)
10.11    Collaboration and Sale/License Agreement, dated August 4, 1997, between
         the Company and Bausch & Lomb  Pharmaceuticals,  Inc. (previously filed
         as exhibit  number 10.19 to Form 10-QSB for the quarter  ended June 30,
         1997 and incorporated by reference.)   **
10.12    Stock Purchase Agreement, dated August 4, 1997, between the Company and
         Bausch & Lomb Pharmaceuticals, Inc. (previously filed as exhibit number
         10.20  to  Form  10-QSB  for  the  quarter  ended  June  30,  1997  and
         incorporated by reference.)
10.13    Form of Subscription  Agreement,  dated as of August 10, 1999,  between
         the Company and the  purchasers of Units  (previously  filed as exhibit
         number 10.14 to Form 10-QSB for the quarter  ended  September  30, 1999
         and incorporated by reference.)
10.14    Form of Redeemable Warrant for the purchase of shares of Class A Common
         Stock,  dated as of August  10,  1999,  issued to  purchasers  of Units
         (previously  filed  as  exhibit  number  10.15 to Form  10-QSB  for the
         quarter ended September 30, 1999 and incorporated by reference.)
23.1     Consent of BDO Seidman, LLP *
23.2     Consent by RubinBaum LLP (included in Exhibit 5.1) *
24.1     Power of Attorney (included on the signature page of this registration
         statement) *
- --------------------------------------------------------------------------------

*        Filed herewith.
** Indicates that material has been omitted and confidential  treatment has been
granted  or  requested  therefor.  All such  omitted  material  has  been  filed
separately with the Commission pursuant to Rule 24b-2.

                                      II-7


                                                                  Exhibit 5.1


                           [Letterhead of RubinBaum ]

                                                         April 24, 2000



Symbollon Corporation
37 Loring Drive
Framingham, Massachusetts  01702

Dear Sirs:

         We  have  acted  as  counsel  to  Symbollon  Corporation,   a  Delaware
corporation (the "Company"),  in connection with the registration by the Company
of the following shares (total of 1,734,360 shares) of its Class A Common Stock,
$.001  par  value  per  share  (the  "Common   Stock")  for  resale  by  selling
stockholders (the "Selling Stockholders") named in the Registration Statement on
Form S-3 (the  "Registration  Statement")  to be filed by the  Company  with the
Securities and Exchange Commission (the "Commission") on April 24, 2000, under
the Securities Act of 1933, as amended (the "Act"):

         1. 836,685 shares of Common Stock issued to the Selling Stockholders in
the Company's  1999 private  placement  (the "Private  Placement") of units each
consisting  of one  share  of  Common  Stock  and one  redeemable  warrant  (the
"Redeemable Warrants") exercisable for one share of Common Stock.

         2. Up to 836,685  shares of Common Stock  issuable upon exercise of the
Redeemable  Warrants included in the units purchased by Selling  Stockholders in
the Private Placement.

         3. Up to 60,990  shares of  Common  Stock  issuable  upon  exercise  of
warrants  (which are identical with the Redeemable  Warrants,  and together with
the Redeemable  Warrants are collectively called the "Warrants") issued pursuant
to the Company's obligation to the placement agent for the Private Placement, as
described  in  the  Registration  Statement,   46,242  of  which  Warrants  were
transferred by the placement agent to certain of its employees.




<PAGE>


RUBINBAUM LLP
- -------------
Symbollon Corporation
April 24, 2000
Page 2

         In  furnishing  this  opinion,  we have  examined  the  Certificate  of
Incorporation and By-laws of the Company,  as amended,  as well as the originals
or photostatic or certified  copies of such  documents,  records,  certificates,
agreements and other papers as we have deemed necessary for the purposes of this
opinion. In such examination, we have assumed the genuineness of all signatures,
the authenticity of all documents  submitted to us as originals,  the conformity
to  executed  documents  of all  unexecuted  copies  submitted  to us,  and  the
authenticity  of, and the  conformity  to,  original documents  of all documents
submitted to us as certified or photostatic  copies.  As to various questions of
fact  material to our  opinion,  we have relied  upon oral  statements,  written
information and certificates of officials and representatives of the Company and
others.

         Based upon the foregoing, we are of the opinion that:

         1.       The 836,685 shares of Common Stock issued to the Selling
Stockholders are legally issued, fully paid and non-assessable.

         2. Up to 896,775  shares of Common Stock  issuable upon exercise of the
Warrants,  if and when paid for and issued  upon  exercise  of the  Warrants  in
accordance  with the terms  thereof,  will be  legally  issued,  fully  paid and
non-assessable.

         We are  members of the Bar of the State of New York,  and the  opinions
expressed herein are limited to questions arising under the laws of the State of
New York, the General  Corporation  Law of the State of Delaware and the Federal
laws of the United  States of America,  and we disclaim  any opinion  whatsoever
with respect to matters governed by the laws of any other jurisdiction.

         We  consent  to  the  filing  of  this  opinion  as an  exhibit  to the
Registration  Statement  and to the  references  to this firm under the  caption
"Legal Matters" in the Prospectus which is a part of the Registration Statement.
In giving this consent,  we do not thereby admit that we are included within the
category of persons whose consent is required  under Section 7 of the Act or the
rules and  regulations of the Commission  promulgated  thereunder.  Reference is
made  to  the  sections  of  the  Registration   Statement   entitled   "Selling
Stockholders"  and  "Legal  Matters"  for a  description  of  ownership  of  the
Company's Common Stock and Warrants by certain attorneys of this firm.

         This  opinion is rendered  solely to you in  connection  with the above
matter.  This  opinion  may not be relied  upon by you for any other  purpose or
relied  upon by or  furnished  to any other  person  without  our prior  written
consent.

Very truly yours,

/s/ RUBINBAUM LLP

RUBINBAUM LLP



                                                              Exhibit 23.1

                        [Letterhead of BDO Seidman, LLP]

Consent of Independent Certified Public Accountants




Symbollon Corporation
Framingham, Massachusetts

We  hereby  consent  to  the   incorporation  by  reference  in  the  Prospectus
constituting a part of this  Registration  Statement of our report dated January
21,  2000,  relating  to  the  financial  statements  of  Symbollon  Corporation
appearing  in the  Company's  Annual  Report on Form  10-KSB  for the year ended
December 31, 1999.

We also  consent  to the  reference  to us under the  caption  "Experts"  in the
Prospectus.



                                                   BDO Seidman, LLP


Boston, Massachusetts
April 24, 2000





© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission