SYMBOLLON CORP
S-3/A, 2000-07-18
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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      As filed with the Securities and Exchange Commission on July 18, 2000
                                                      Registration No. 333-35446
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                   ----------
                                 AMENDMENT NO. 2
                                       TO
                                    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. [ ]

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 JULY 18, 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.  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 July 17, 2000,  the last reported sale price of our common stock on
the Nasdaq SmallCap Market was $8.00 per share.

See "Risk  factors"  beginning on page 4 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
                                                                           ----
Symbollon Corporation.......................................................-2-

Risk Factors................................................................-4-

Use of Proceeds............................................................-10-

Selling Stockholders.......................................................-11-

Plan of Distribution.......................................................-13-

Legal Matters..............................................................-15-

Experts....................................................................-15-

Where You Can Find More Information........................................-15-

Note Concerning Forward Looking Statements.................................-16-


                              SYMBOLLON CORPORATION

         We are engaged in  development  and  commercialization  of  proprietary
iodine-based  products.  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.  Our
technology  accomplishes this by controlling the ratio of molecular iodine (I2),
to the other inactive  species of iodine typically  present in solution.  Iodine
has been shown to be effective in rapidly  eliminating a wide range of germs and
as a therapeutic for certain  pharmaceutical  applications.  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 manufactured a bovine teat sanitizer,  IodoZyme(R),
for 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. West Agro markets and distributes IodoZyme under an exclusive marketing and
supply  agreement  which covers  IodoZyme as well as other products which we may

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<PAGE>

develop for use in dairy  facilities.  West Agro has the right to terminate  the
marketing  and  supply  agreement  at any time.  1999  sales for  IodoZyme  were
$425,209.

Women's Healthcare

         We have developed an oral dosage form of our technology  that generates
molecular  iodine in the  stomach  of the  patient.  We refer to this  tablet as
IoGen(TM).  Based on the  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
primarily  women of childbearing  age.  Medical  literature  indicates that this
condition  is  observed  in  50%  of  childbearing  age  women  during  lifetime
examinations and in 90% of those women during postmortem examinations.  A market
research  study  published in 1995  estimates that in the United States about 24
million women, or approximately 30% of childbearing age women, report painful or
lumpy  breast.  However,  that market  research  study  indicates  that only 3.3
million of those women have been formally diagnosed with the disease.

         During 1999,  we conducted a Phase I trial of IoGen.  Eighteen  healthy
females  participated.  The trial  assessed  dose  proportionality  and relative
absorption of IoGen tablets at three concentrations,  1.5 mg, 3.0 mg and 6.0 mg,
based on blood and urine  samples  collected  over a  48-hour  period  following
dosing. In the Phase I study, the participants tolerated IoGen at all three dose
levels and no drug-related adverse events occurred.

         Analysis of the results  demonstrated  that IoGen is  dose-proportional
when evaluated by either peak or mean iodine concentration in the blood samples.
The results also indicated relative  absorption of the 1.5, 3.0 and 6.0 mg IoGen
tablets, as measured by the excreted iodine concentrations in urine samples.

         We recently  also  completed a  multi-center  Phase II clinical  trial,
initiated  in 1998,  evaluating  IoGen  in  patients  with  moderate  to  severe
fibrocystic breast disease to assess 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.

         If the results  from the Phase II clinical  trial  warrant,  we plan to
continue the clinical development of IoGen. We will 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.  We are working on potential
dermatological formulations, but have not finalized a product candidate suitable
for clinical trials.  Resources allowing, our goal is to initiate human clinical
trials  in  dermatology.   A  collaboration  with  another  company  to  develop
dermatological products was terminated by that company in 1999.

                                       3
<PAGE>

         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.  In May 2000, we waived a 90-day
notice provision under our  collaboration  agreement with Bausch & Lomb in order
to allow  Bausch & Lomb  additional  time to gather  more  information  prior to
making a decision on whether to  continue  their  relationship  with us. We also
extended by two months to October 4, 2000 Bausch & Lomb's obligation to make the
next milestone payment of $800,000. If Bausch & Lomb does desire to continue the
relationship,   we  have  agreed  to  enter  into   negotiations  to  amend  the
collaboration  to reflect a more realistic and achievable  development  plan and
milestone  payment schedule.  Therefore,  it is uncertain if we will receive the
next milestone payment from Bausch & Lomb.

         If Bausch & Lomb elects to terminate its  sale/license  agreement  with
us,  then Bausch & Lomb would be  required  to  transfer  482,878  shares of our
common stock to us for no consideration. Those shares were purchased by Bausch &
Lomb for  $500,000.  Bausch & Lomb would also then have a right to require us to
redeem 93,334 shares of our common stock for $175,000  (Bausch & Lomb's purchase
price)  if we have  adequate  positive  cash flow  from  operations  in any year
through 2004.

         If Bausch & Lomb terminates its sale/license agreement with us, then
all rights and title to our technology sold or licensed to Bausch & Lomb under
the agreement will revert back to us.

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.


We expect to incur additional losses in the future that will require us to raise
substantial funding

         We have  incurred a cumulative  operating  loss of  $6,665,850  through
March 31, 2000.  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,   including
preclinical  and clinical  testing.  In the next few years,  our revenues may be
limited to sales of IodoZyme, contract research payments and licensing milestone

                                       4
<PAGE>

payments under the Bausch & Lomb agreement  (unless  terminated) and any amounts
received  under  other  research  or  development  collaborations  that  we  may
establish.

         Based on the current  status of our  development  efforts,  we will not
receive  revenues  or  royalties  from  commercial  sales  of  our  drugs  under
development for a significant  number of years, if at all. For at least the next
few  years,  we  expect  our  revenues  to be less  than our  expenses.  We will
therefore need to raise additional funding to sustain our operations. If we fail
to achieve profitable operations or raise additional funding to cover losses, we
will not be able to sustain operations.

If our corporate licensing relationships are terminated, our future revenues
will significantly decrease

         We generate our revenues  from  corporate  licensing  arrangements.  In
1999, Oclassen  Pharmaceuticals  Inc., our 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 and  recently
completed is the first trial to evaluate the  effectiveness of IoGen. We did not
conduct any animal or human studies to evaluate the potential  effectiveness  of
IoGen before  launching the Phase II trial.  We do not yet have the results from
the  IoGen  Phase II  trial.  We  estimate  that  our  investment  in the  IoGen
development  program exceeded $2.5 million.  We expensed these development costs
as incurred.  If the Phase II clinical  trial is not  successful,  our financial
situation may force us to discontinue the IoGen development program.

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
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.  If our arrangement with Bausch & Lomb continues,
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.


                                       5
<PAGE>


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.  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 the development program.  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 has the right to terminate  the
relationship  at any time and is  currently  considering  this  option.  If they
terminate the  relationship,  our limited  resources  would severely  hamper our
ability to develop an ophthalmic product.

         IodoZyme's future growth and profitability  will depend, in large part,
on the success of West Agro's 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
compete directly with IodoZyme.

If we cannot raise additional funds, then we will have to limit our future
activities

         We have adequate cash resources to complete our IoGen Phase II clinical
trial and continue our base operations  through 2001.  However,  we will require
substantial  additional funds if we are to continue the clinical  development of
IoGen or pursue the development of additional  products.  We cannot estimate the
amount or timing of our need for future  funding  since this is dependent on the
scope and nature of product development not yet known.

         We intend to seek additional funds for such future product  development
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

                                       6
<PAGE>

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 are not available when needed, we would be forced to limit the
scope of our development or perhaps cease operations.

If a competitive drug is marketed to treat  fibrocystic  breast disease prior to
IoGen,  then the  potential  market  opportunity  for  IoGen  will be  adversely
affected

         The  only  drug   approved   by  the  United   States   Food  and  Drug
Administration  (commonly  called FDA) for the treatment of  fibrocystic  breast
disease  is  Danazol,  a  masculinizing  hormone.  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, they may achieve a significant  competitive  advantage through FDA
marketing  exclusivity rights. This would delay our ability to receive marketing
approval.

IodoZyme could become  subject to FDA marketing  clearance that could affect our
ability to market IodoZyme

         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 it is possible that if
such  guidelines are adopted that IodoZyme will require  clearance by the FDA 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.

We have no marketing experience within our company

         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,  we  might  have
difficulty  obtaining the requisite  funds or attracting and retaining the human
resources   necessary  to   successfully   market  any  products.

Because  our iodine-based products may stain or corrode some surfaces, potential
applications for our products may not be possible

         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  products  that clean  germs from
certain  medical and dental  instruments  as a result of staining and  corrosion
caused by the required concentrations of iodine in the formulations. We continue

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<PAGE>

to investigate  the balance  between the level of efficacy and the need to avoid
staining  and  corrosion.  For any  proposed  product  application,  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  these  staining and
corrosion problems.

Our use of hazardous  materials in our development  and commercial  efforts
exposes  us to  material  potential  liability

         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.

Our  ability to issue  preferred  stock  without  stockholder  approval  and our
classified  Board of  Directors  could  prevent  a change in  control  and could
adversely affect our stock price

         Our Certificate of Incorporation,  as amended,  authorizes the issuance
of 5,000,000 shares of preferred stock, none of which are outstanding,  on terms
that 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.

         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.

We are a development stage company with a volatile stock price

         The  stock   market   prices  of   emerging   and   development   stage
biopharmaceutical  companies  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,  drug  cost  reimbursement  developments,  developments  concerning
proprietary rights,  litigation or public concern as to safety of products,  may
have a significant  adverse  impact on our stock price.  Over the last 12 months
our stock price has ranged from $14.00 to $1.75.

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<PAGE>


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.

Exercise  of outstanding warrants and options may adversely affect our stock
price

         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
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.

If we are delisted from the Nasdaq SmallCap Market, stockholders may suffer

         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 March  31,  2000,  our  balance  sheet  showed  total  assets of
$3,279,310  and  stockholders'  equity  of  $2,638,882.  Since we are  expecting
continuing  losses during 2000, we may not be able to meet the continued listing

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<PAGE>

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 our 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  price
quotations for our stock.

If we become subject to penny stock rules, our stock will be adversely affected

         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.

Since there are few market makers for our stock, they can substantially
influence its price

         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.

                                 USE OF PROCEEDS

            The selling  stockholders  will sell all of the common stock covered
by this prospectus. 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 be used for working  capital and other  general
corporate purposes.


                                       10
<PAGE>


                              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 (the  placement  agent  transferred  some of those  warrants to
certain of its  employees).  We issued  these  warrants as  compensation  to the
placement  agent,  in addition to paying the  placement  agent  $106,733 (in the
aggregate) as a 10% cash commission 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.


                                       11
<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)             288,110        75,110        363,220      9.6%      97,210    266,010    7.2%
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>

                                       12
<PAGE>

*        Less than 1% of the common stock outstanding.
(1)      Exclusive of shares underlying warrants.
(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 2.
(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
transactions,  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

                                       13
<PAGE>

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
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.


                                       14
<PAGE>

         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
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 the 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.

                       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
                                       15
<PAGE>

of 1934 until this offering has been completed:

          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
              held on May 24, 2000.
          o   Our Quarterly Report on Form 10-QSB for the quarterly period ended
              March 31, 2000.
          o   The  description  of our Class A Common Stock  contained under the
              heading  "Description  of  Securities"  in our Registration
              Statement on  Form  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 4,  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.


                                       16
<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                                   9,000
            Miscellaneous                                               773
                                                                   --------
            Total                                                   $15,000
                                                                    =======

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 the registration
      statement) *
-------------------------------------------------------------------------------

*        Previously filed.
**       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 Amendment to
the  Registration  Statement  to be  signed on its  behalf  by the  undersigned,
thereunto  duly  authorized,   in  the  City  of  Framingham,   Commonwealth  of
Massachusetts, on July 18, 2000.

                                     SYMBOLLON CORPORATION

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

            Pursuant to the  requirements  of the Securities  Act of 1933,  this
Amendment to the 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,           July 18, 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, July 18, 2000
-----------------------------  Treasurer, General Counsel, Chief
    Paul C. Desjourdy          Financial Officer, and Director (Principal
                               Financial and Accounting Officer)


          *                    Director                           July 18, 2000
-----------------------------
    James C. Richards

          *                    Director                           July 18, 2000
-----------------------------
    Richard F. Maradie

          *                    Director                           July 18, 2000
-----------------------------
    Eugene Lieberstein

* By:   /s/ Paul C. Desjourdy
     -----------------------------------
     Paul C. Desjourdy, Attorney-in-fact


                                      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 the registration
         statement) *
-------------------------------------------------------------------------------
*        Previously filed.
**       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



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