Document:

<PAGE>   1
                                                                   Exhibit 10.43

--------------------------------------------------------------------------------

                       TWIN LABORATORIES INC., as Issuer,

                                       and

                           THE GUARANTORS NAMED HEREIN

                                       and

                 STATE STREET BANK AND TRUST COMPANY, as Trustee

                          FOURTH SUPPLEMENTAL INDENTURE

                          Dated as of January 25, 2O00

                                       to

                                    INDENTURE

                  Dated As of May 7, 1996 as supplemented as of
                      December 1, 1997, as of May 14, 1998
                          and as of September 15, 1998

                                   ----------

                   10-1/4% Senior Subordinated Notes due 2006

<PAGE>   2

            FOURTH SUPPLEMENTAL INDENTURE, dated as of January 25, 2000, by and
among TWIN LABORATORIES INC., a Utah corporation (the "Company"), ADVANCED
RESEARCH PRESS, INC., a New York corporation ("Advanced"), TWINLAB CORPORATION,
a Delaware corporation formerly named TLG Laboratories Holding Corp. ("Holding
Company"), CHANGES INTERNATIONAL OF FORT WALTON BEACH, INC., a Florida
corporation ("Changes"), BRONSON LABORATORIES INC., a Delaware Corporation
("Bronson"), HEALTH FACTORS INTERNATIONAL, INC., a Delaware corporation ("Health
Factors"), PR NUTRITION, INC., a California corporation ("PR Nutrition"), and
Twinlab FSC Inc., a Barbados corporation ("FSC"), as Guarantors, and State
Street Bank and Trust Company, a Massachusetts bank and trust company (successor
to Fleet National Bank), as Trustee (the "Trustee").

            WHEREAS, the Company, Advanced, Holding Company and Fleet National
Bank, as Trustee, executed an Indenture, dated as of May 7, 1996 (the
"Indenture"), in respect of $100,000,000 aggregate principal amount of the
Company's 10-1/4% Senior Subordinated Notes due 2006 (the "Securities");

            WHEREAS, State Street Bank and Trust Company is the successor to
Fleet National Bank, as Trustee under the Indenture;

            WHEREAS, the Company, Advanced, Holding Company, Changes and the
Trustee executed the First Supplemental Indenture dated as of December 1, 1997
(the "First Supplemental Indenture");

            WHEREAS, the Company, Advanced, Holding Company, Changes, Bronson,
Health Factors and the Trustee executed the Second Supplemental Indenture dated
as of May 14, 1998 (the "Second Supplemental Indenture");

            WHEREAS, the Company, Advanced, Holding Company, Changes, Bronson,
Health Factors, PR Nutrition and the Trustee executed the Third Supplemental
Indenture dated as of September 15, 1998 (the "Third Supplemental Indenture");

            WHEREAS, the term Indenture as hereinafter used in this Fourth
Supplemental Indenture shall mean the Indenture as amended by the First
Supplemental Indenture, the Second Supplemental Indenture and the Third
Supplemental Indenture;

            WHEREAS, Section 11.3 of the Indenture requires, under circumstances
specified in Section 11.3, that certain Subsidiaries of the Company execute and
deliver to the Trustee a supplemental indenture pursuant to which such
Subsidiaries of the Company shall be named as additional Subsidiary Guarantors;
and

            WHEREAS, all conditions and requirements necessary to make this
Fourth Supplemental Indenture a valid, binding and legal instrument in
accordance with its terms have

<PAGE>   3

been performed and fulfilled and the execution and delivery hereof have been in
all respects duly authorized.

            NOW, THEREFORE, in consideration of the above premises, each party
agrees, for the benefit of each other party and for the equal and ratable
benefit of the Holders of the Securities, as follows:

                                    ARTICLE I

                                   AMENDMENTS

            Section 1. The Company, Advanced, Holding Company, Changes, Bronson,
Health Factors, PR Nutrition and FSC and the Trustee hereby amend the Indenture
and agree that FSC shall be a Subsidiary Guarantor, a Guarantor and a Future
Subsidiary Guarantor for all purposes under the Indenture and each of the terms
"Subsidiary Guarantor", "Guarantor" and "Future Subsidiary Guarantor" shall for
all purposes under the Indenture specifically include FSC.

                                   ARTICLE II

                            MISCELLANEOUS PROVISIONS

            Section 2.1. Terms Defined. For all purposes of this Fourth
Supplemental Indenture, except as otherwise defined or unless the context
otherwise requires, terms used in capitalized form in this Fourth Supplemental
Indenture and defined in the Indenture have the meanings specified in the
Indenture.

            Section 2.2. Indenture. Except as amended hereby, the Indenture and
the Securities are in all respects ratified and confirmed and all their terms
shall remain in full force and effect.

            Section 2.3. Governing Law. THIS FOURTH SUPPLEMENTAL INDENTURE SHALL
BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW
YORK, AS APPLIED TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF NEW YORK,
WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS.

            Section 2.4. Successors and Assigns. All agreements of the Company,
Advanced, Holding Company, Changes, Bronson, Health Factors, PR Nutrition and
FSC in this Fourth Supplemental Indenture and the Securities shall bind their
respective successors and assigns.

                                      - 3 -
<PAGE>   4

            Section 2.5. Multiple Counterparts. This Fourth Supplemental
Indenture may be executed in any number of counterparts, each of which shall be
an original; but such counterparts shall together constitute but one and the
same instrument.

            Section 2.6. Effectiveness. The provisions of this Fourth
Supplemental Indenture shall become effective immediately upon its execution and
delivery by the Trustee in accordance with the provisions of Article IX of the
Indenture.

            Section 2.7. Trustee Disclaimer. The Trustee accepts the amendment
of the Indenture effected by this Fourth Supplemental Indenture and agrees to
execute the trust created by the Indenture as hereby amended, but only upon the
terms and conditions set forth in the Indenture, including the terms and
provisions defining and limiting the liabilities and responsibilities of the
Trustee, which terms and provisions shall in like manner define and limit its
liabilities and responsibilities in the performance of the trust created by the
Indenture as hereby amended, and, without limiting the generality of the
foregoing, the Trustee shall not be responsible in any mariner whatsoever for or
with respect to any of the recitals (other than the second recital) or
statements contained herein, all of which recitals or statements are made solely
by the Company, Advanced, Holding Company, Changes, Bronson, Health Factors, PR
Nutrition and FSC or for or with respect to (i) the validity, efficacy or
sufficiency of this Fourth Supplemental Indenture or any of the terms or
provisions hereof, (ii) the proper authorization hereof by the Company,
Advanced, Holding Company, Changes, Bronson, Health Factors, PR Nutrition and
FSC by corporate action or otherwise, (iii) the due execution hereof by the
Company, Advanced, Holding Company, Changes, Bronson, Health Factors, PR
Nutrition and FSC, or (iv) the consequences (direct or indirect and whether
deliberate or inadvertent) of any amendment herein provided for, and the Trustee
makes no representation with respect to any such matters.

            Section 2.8 Headings. The headings of the Articles and Sections of
this Fourth Supplemental Indenture have been inserted for convenience of
reference only, are not to be considered a part hereof and shall in no way
modify or restrict any of the terms or provisions hereof.

                     [Remainder of Page Intentionally Blank]

                                      - 4 -
<PAGE>   5

                                   SIGNATURES

            IN WITNESS WHEREOF, the parties hereto have caused this Fourth
Supplemental Indenture to be duly executed, all as of the date first written
above.

TWIN LABORATORIES INC.,                    TWINLAB CORPORATION,
as Issuer

By: /s/ Ross Blechman                      By: /s/ Ross Blechman
   --------------------------------           ----------------------------------
   Name: Ross Blechman                        Name: Ross Blechman
    Title: Chairman, CEO, President           Title: Chairman, CEO, President

ADVANCED RESEARCH PRESS,                   CHANGES INTERNATIONAL OF
INC.                                       FORT WALTON BEACH, INC.

By: /s/ Ross Blechman                      By: /s/ Ross Blechman
   --------------------------------           ----------------------------------
   Name: Ross Blechman                        Name: Ross Blechman
   Title: Executive Vice President            Title: Chairman

BRONSON LABORATORIES, INC.                 HEALTH FACTORS
INTERNATIONAL, INC.

By: /s/ Ross Blechman                      By: /s/ Ross Blechman
   --------------------------------           ----------------------------------
   Name: Ross Blechman                        Name: Ross Blechman
   Title: Chairman, CEO, President            Title: Chairman, CEO, President

TWINLAB FSC INC.                           PR NUTRITION, INC.

By: /s/ Ross Blechman                      By: /s/ Ross Blechman
   --------------------------------           ----------------------------------
   Name: Ross Blechman                        Name: Ross Blechman
   Title:                                     Title: Chairman & CEO

STATE STREET BANK AND TRUST
COMPANY, as Trustee

By: /s/ Elizabeth C. Hammer
   --------------------------------
   Name:   Elizabeth C. Hammer
   Title:    VICE PRESIDENT

                                      - 5 -<PAGE>   1
                                                                   Exhibit 10.44

                                    ORIGINAL

                           FIRST AMENDMENT AND WAIVER

            FIRST AMENDMENT AND WAIVER, dated as of March 22, 1999 (this
"Amendment"), to the Amended and Restated Credit and Guarantee Agreement, dated
as of November 15, 1996 (as amended, supplemented or otherwise modified from
time to time, the "Credit Agreement"), among Twinlab Corporation, a Delaware
corporation ("Holdings"), Twin Laboratories Inc., a Utah corporation (the
"Borrower"), the several banks and other financial institutions parties to the
Credit Agreement (the "Lenders"), The Bank of New York, as documentation agent
for the Lenders thereunder (in such capacity, the "Documentation Agent"), and
The Chase Manhattan Bank, as administrative agent for the Lenders thereunder (in
such capacity, the "Administrative Agent").

                              W I T N E S S E T H:

            WHEREAS, the Borrower has requested that the Administrative Agent
and the Lenders amend the Credit Agreement (i) to allow Holdings to repurchase
up to 5 million shares of its common stock in the open market or in privately
negotiated transactions for an aggregate amount of up to $40,000,000; and (ii)
to waive certain covenants and defaults arising from the Borrower's failure to
deliver certain financial statements in accordance with GAAP or to give prompt
notice of pending or threatened claims, litigations and proceedings, and confirm
that the terms of the financing from Zions First National Bank are reasonably
satisfactory to them;

            WHEREAS, the Administrative Agent and the Lenders are willing to
agree to the requested amendments and waivers on the terms and conditions
contained herein;

            NOW, THEREFORE, in consideration of the premises and the mutual
covenants contained herein, the parties agree as follows:

            1. Definitions. Unless otherwise defined herein, terms defined in
the Credit Agreement shall have their defined meanings when used herein.

            2. Amendments to the Credit Agreement. (a) Subsection 4.2 of the
Credit Agreement is hereby amended by changing the date in clause (a) thereof to
the following:

      "September 30, 1998 (after giving effect to the restatement of the
      consolidated financial statements of the Borrower for the fiscal quarter
      then ended as described in the press release of Holdings dated February
      24, 1999)."

            (b) Subsection 4.6 of the Credit Agreement is hereby amended by
inserting the phrase "and Schedule 4.6A" immediately following the phrase
"Schedule 4.6" therein.

            (c) Subsection 4.16 of the Credit Agreement is hereby amended by (i)
deleting the word "and" appearing immediately prior to subclause (iv) of said
subsection; (ii)

<PAGE>   2
                                                                               2

inserting a ";" at the end of subclause (iii) of said subsection; (iii)
replacing the period at the end of subclause (iv) of said subsection with a ";"
and (iv) inserting the following new clause following subclause (iv) of said
subsection:

            "and (v) amounts used to make Restricted Payments pursuant to
      subsection 7.7(f)."

            (d) Section 4 of the Credit Agreement is hereby amended by adding
the following subsection after subsection 4.22:

            "4.23 Year 2000 Matters. Any reprogramming required to permit the
      proper functioning (but only to the extent that such proper functioning
      would otherwise be impaired by the occurrence of the year 2000) in and
      following the year 2000 of computer systems and other equipment containing
      embedded microchips, in either case owned or operated by the Borrower or
      any of its Subsidiaries in the conduct of their business (including any
      such systems and other equipment supplied by others), and the testing of
      all such systems and other equipment as so reprogrammed, will be completed
      by September 30, 1999. The costs to the Borrower and its Subsidiaries that
      have not been incurred as of the date hereof for such reprogramming and
      testing and for the other reasonably foreseeable consequences to them of
      any improper functioning of other computer systems and equipment
      containing embedded microchips due to the occurrence of the year 2000
      could not reasonably be expected to result in a Default or Event of
      Default or to have a Material Adverse Effect. Except for any reprogramming
      referred to above, the computer systems of the Borrower and its
      Subsidiaries are and, with ordinary course upgrading and maintenance, will
      continue for the term of this Credit Agreement to be, sufficient in all
      material aspects for the conduct of their business as currently
      conducted."

            (e) Subsection 7.7 of the Credit Agreement is hereby amended by (i)
inserting "or Holdings" immediately before the phrase "or any warrants or
options to purchase any such Stock" in the introductory paragraph of said
subsection; and (ii) inserting the following phrase immediately before the
phrase "except that" in the introductory paragraph of said subsection:

      "or enter into any derivatives or other transaction with any financial
      institution, commodities or stock exchange or clearinghouse (a
      "Derivatives Counterparty") obligating it to make payments to such
      Derivatives Counterparty as a result of any change in market value of any
      such Capital Stock (any such transaction, an "Equity Derivatives
      Transaction"),"

            (f) Subsection 7.7 of the Credit Agreement is further amended by (i)
deleting the word "and" appearing immediately prior to subclause (e) of said
subsection, (ii) replacing the period at the end of subclause (e) with "; and"
and (iii) inserting the following new clause following subclause (e):

<PAGE>   3
                                                                               3

            "(f) the Borrower may make any Restricted Payment to enable Holdings
      to repurchase its common stock, provided that, after giving effect to any
      such Restricted Payment: (i) no Default or Event of Default shall have
      occurred and be continuing; (ii) the Restricted Payments made under this
      paragraph (f) after the Amendment Effective Date (as defined in the First
      Amendment and Waiver to this Credit Agreement) do not exceed $40,000,000;
      (iii) the amount available for borrowing by the Borrower under the
      Revolving Credit Commitments is not less than $15,000,000 and (iv) the
      Borrower shall be in pro forma compliance with the covenants in subsection
      7.1 as of the end of the most recent fiscal quarter for which financial
      statements are available (assuming that the Restricted Payments made under
      this paragraph (f) had been made as of the first day of the four-fiscal
      quarter period ended with such most recent fiscal quarter).

            (g) Subsection 8.1 of the Credit Agreement is hereby amended by
inserting the following phrase before the word "and" that appears immediately
before subclause (iii)(E) of said subsection:

      ", and the repurchase of its common stock in respect of which Restricted
      Payments were or may be made by the Borrower under subsection 7.7(f) in an
      amount sufficient to cover the maximum amount payable by Holdings
      thereunder."

            (h) The Credit Agreement is hereby amended by adding thereto a new
Schedule 4.6A as set forth in Annex A to this Amendment setting forth certain
additional litigation (the "New Scheduled Litigation").

            3. Waivers to the Credit Agreement. (a) Waiver of Covenants. The
Administrative Agent and the Lenders hereby waive compliance by the Borrower
with the provisions of subsections 6.1, 6.2, 6.6 and 6.7 of the Credit
Agreement, solely insofar as the Borrower's failure to (i) deliver monthly or
quarterly financial statements in accordance with GAAP for the first three
fiscal quarters of its 1998 fiscal year or (ii) give prompt notice to the
Administrative Agent of pending or threatened claims, litigations or proceedings
affecting the Borrower and Holdings as disclosed on Schedule 4.6A might
otherwise be deemed to result in a breach of any of the covenants contained in
such subsections.

            (b) Waiver of Representations and Warranties. The Administrative
Agent and the Lenders hereby waive any breach by the Borrower of any
representation or warranty made or deemed to be made by it pursuant to
subsection 5.2 of the Credit Agreement, solely insofar as such breach arises out
of the matters described in clauses (i) and (ii) of Section 3(a) of this
Amendment or the New Scheduled Litigation.

            (c) Waiver of Certain Defaults. The Administrative Agent and the
Lenders hereby agree that the waivers contained in Sections 3(a) and 3(b) of
this Amendment shall have effect for purposes of subsections 10(b) and 10(d) of
the Credit Agreement.

            4. Agreement of Required Lenders. By their execution of this
Amendment, the Required Lenders confirm (a) for purposes of subsection 7.2(1) of
the Credit Agreement, that the terms of the financing from Zions First National
Bank described in the term sheet attached

<PAGE>   4
                                                                               4

hereto as Annex B to this Amendment are reasonably satisfactory to them and (b)
that the Administrative Agent is authorized in its discretion to enter into a
subordination agreement on terms acceptable to the Administrative Agent
subordinating the lien benefitting the Administrative Agent and the lenders on
the property referred to in said term sheet to a lien thereon benefitting Zions
First National Bank and securing its financing.

            5. Conditions to Effectiveness. This Amendment shall be effective on
the conditions that (a) the Administrative Agent shall have received
counterparts hereof, duly executed and delivered by the Borrower and Holdings
and consented to by the Required Lenders and the Grantors under the Guarantee
and Collateral Agreement dated as of May 7, 1996 (the "Guarantee and Collateral
Agreement") among Holdings, the Borrower, the Subsidiary Guarantors named
therein and the Administrative Agent; (b) the Administrative Agent shall have
received, for the account of each Lender which executes and delivers this
Amendment, an amendment fee in the amount of $7,500 per Lender; (c) no Default
or Event of Default shall have occurred and be continuing on the date hereof
after giving effect to this Amendment; and (d) the Administrative Agent shall
have received drafts of restated consolidated financial statements for the first
three fiscal quarters of the 1998 fiscal year of the Borrower, together with
certificates with respect thereto, as contemplated by subsection 6.2(b) of the
Credit Agreement, and such financial statements shall be consistent with the
press release of Holdings dated February 24, 1999. The date on which all of the
above conditions are met shall be the date of effectiveness of this Amendment
(the "Amendment Effective Date").

            6. Representations and Warranties. In order to induce the
Administrative Agent and the Lenders to enter into this Amendment, the Borrower
and Holdings hereby represent and warrant to the Administrative Agent and the
Lenders that (a) the representations and warranties of the Borrower and Holdings
contained in the Loan Documents are true and correct in all material respects on
and as of the Amendment Effective Date (after giving effect hereto) as if made
on and as of the Amendment Effective Date (except where such representations and
warranties expressly relate to an earlier date in which case such
representations and warranties were true and correct in all material respects as
of such earlier date); provided that all references to the "Credit Agreement" in
any Loan Document shall be and are deemed to mean the Credit Agreement as
amended hereby; and (b) the financial statements delivered to the Administrative
Agent and the Lenders pursuant to Section 5(d) of this Amendment will present
fairly in accordance with GAAP the consolidated financial conditions of the
Borrower and Holdings as at such date and the consolidated results of their
operations for the fiscal quarter then ended.

            7. Notice of Effectiveness. The Administrative Agent shall promptly
advise the Lenders and the Borrower that this Amendment has become effective.

            8. Applicable Law and Jurisdiction. This Amendment has been executed
and delivered in New York, New York, and the rights and obligations of the
parties hereto shall be governed by, and shall be construed and enforced in
accordance with, the laws of the State of New York.

<PAGE>   5
                                                                               5

            9. Counterparts. This Amendment may be executed by the parties
hereto in any number of separate counterparts and all of said counterparts taken
together shall be deemed to constitute one and the same instrument.

            10. Successors and Assigns. This Amendment shall be binding upon and
inure to the benefit of the Borrower and Holdings and their respective
successors and assigns, and upon the Administrative Agent and the Lenders and
their successors and assigns. The execution and delivery of this Amendment by
any Lender prior to the Amendment Effective Date shall be binding upon its
successors and assigns and shall be effective as to any loans or commitments
assigned to it after such execution and delivery.

            11. Continuing Effect. Except as expressly amended hereby, the
Credit Agreement as amended by this Amendment shall continue to be and shall
remain in full force and effect in accordance with its terms. This Amendment
shall not constitute an amendment or waiver of any provision of the Credit
Agreement not expressly referred to herein and shall not be construed as an
amendment, waiver or consent to any action on the part of the Borrower and
Holdings that would require an amendment, waiver or consent of the
Administrative Agent or the Lenders except as expressly stated herein. Any
reference to the "Credit Agreement" in the Loan Documents or any related
documents shall be deemed to be a reference to the Credit Agreement as amended
by this Amendment.

<PAGE>   6
                                                                               6

            IN WITNESS WHEREOF, the parties have caused this Amendment to be
executed and delivered by their respective duly authorized officers as of the
day and year first above written.

                                  TWINLAB CORPORATION

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  TWIN LABORATORIES INC.

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  THE CHASE MANHATTAN BANK as
                                  Administrative Agent, Issuing Bank, Swing Line
                                  Lender and as a Lender

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

Consented to:

THE BANK OF NEW YORK, as Co-Agent and as a Lender

By:
   ------------------------------
  Name:
  Title:

<PAGE>   7
                                                                               7

THE FIRST NATIONAL BANK OF BOSTON, as a Lender

By:
   ------------------------------
  Name:
  Title:

DRESDNER BANK AG, NEW YORK BRANCH AND GRAND CAYMAN BRANCH, as a
Lender

By:
   ------------------------------
  Name:
  Title:

By:
   ------------------------------
  Name:
  Title:

U.S. BANK NATIONAL ASSOCIATION, as a Lender

By:
   ------------------------------
  Name:
  Title:

EUROPEAN AMERICAN BANK, as a Lender

By:
   ------------------------------
  Name:
  Title:

<PAGE>   8
                                                                               8

ERSTE BANK DER OESTERREICHISCHEN SPARKASSEN AG,
GRAND CAYMAN ISLAND BRANCH, as a Lender

By:
   ------------------------------
  Name:
  Title:

ZIONS FIRST NATIONAL BANK, as a Lender

By:
   ------------------------------
  Name:
  Title:

ADVANCED RESEARCH PRESS, INC., as a Grantor

By:
   ------------------------------
  Name:
  Title:

<PAGE>   9

                                     ANNEX A

                                  Schedule 4.6A

                            New Scheduled Litigation

<PAGE>   10

                                     ANNEX B

                    Financing from Zions First National Bank

                            [See Attached Term Sheet]

<PAGE>   11

THE FIRST NATIONAL BANK OF BOSTON, as a Lender

By:
   ------------------------------
  Name:
  Title:

DRESDNER BANK AG, NEW YORK BRANCH AND GRAND CAYMAN BRANCH, as a
Lender

By:
   ------------------------------
  Name:
  Title:

By:
   ------------------------------
  Name:
  Title:

U.S. BANK NATIONAL ASSOCIATION, as a Lender

By:
   ------------------------------
  Name:
  Title:

EUROPEAN AMERICAN BANK, as a Lender

By: /s/ Kristen Burke
   ------------------------------
  Name: Kristen Burke
  Title: Vice President

<PAGE>   12
                                                                               5

            IN WITNESS WHEREOF, the parties have caused this Amendment to be
executed and delivered by their respective duly authorized officers as of the
day and year first above written.

                                  TWINLAB CORPORATION

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  TWIN LABORATORIES INC.

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  THE CHASE MANHATTAN BANK as
                                  Administrative Agent, Issuing Bank, Swing Line
                                  Lender and as a Lender

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

Consented to:

THE BANK OF NEW YORK, as Co-Agent and as a Lender

By: /s/ Steven E. Ratner
   ------------------------------
  Name:  Steven E. Ratner
  Title: Vice President

<PAGE>   13
                                                                               7

THE FIRST NATIONAL BANK OF BOSTON, as a Lender

By:
   -----------------------------------------
  Name:
  Title:

DRESDNER BANK AG, NEW YORK BRANCH AND GRAND CAYMAN BRANCH, as a
Lender

By: /s/ John W. Sweeney
   -----------------------------------------
  Name:        JOHN W. SWEENEY
  Title:   ASSISTANT VICE PRESIDENT

By: /s/ Beverly G. Cason
   -----------------------------------------
  Name:   BEVERLY G. CASON
  Title:   VICE PRESIDENT

U.S. BANK NATIONAL ASSOCIATION, as a Lender

By:
   -----------------------------------------
  Name:
  Title:

EUROPEAN AMERICAN BANK, as a Lender

By:
   -----------------------------------------
  Name:
  Title:

<PAGE>   14
                                                                               7

THE FIRST NATIONAL BANK OF BOSTON, as a Lender

By:
   -----------------------------------------
  Name:
  Title:

DRESDNER BANK AG, NEW YORK BRANCH AND GRAND CAYMAN BRANCH, as a
Lender

By:
   -----------------------------------------
  Name:
  Title:

By:
   -----------------------------------------
  Name:
  Title:

U.S. BANK NATIONAL ASSOCIATION, as a Lender

By: /s/ Kurt D. Egertson
   ------------------------------------------
  Name:  Kurt D. Egertson
  Title: Vice President

EUROPEAN AMERICAN BANK, as a Lender

By:
   -----------------------------------------
  Name:
  Title:

<PAGE>   15
                                                                               7

GIROCREDIT BANK AKTIENGESELLSCHAFT DER SPARKASSEN, GRAND CAYMAN
ISLAND BRANCH, as a Lender

By:
   -----------------------------------------
  Name:
  Title:

ZIONS FIRST NATIONAL BANK, as a Lender

By:  /s/ P. Boyd Hales
   -----------------------------------------
  Name:  P. Boyd Hales
  Title: Vice President

ADVANCED RESEARCH PRESS, INC., as a Grantor

By:
   -----------------------------------------
  Name:
  Title:

<PAGE>   16
                                                                               6

            IN WITNESS WHEREOF, the parties have caused this Amendment to be
executed and delivered by their respective duly authorized officers as of the
day and year first above written.

                                  TWINLAB CORPORATION

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  TWIN LABORATORIES INC.

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  THE CHASE MANHATTAN BANK as
                                  Administrative Agent, Issuing Bank, Swing Line
                                  Lender and as a Lender

                                  By: /s/ Dawn Lee Lum
                                     -------------------------------------------
                                     Name:  Dawn Lee Lum
                                     Title: Vice President

Consented to:

THE BANK OF NEW YORK, as Co-Agent and as a Lender

By:
   ------------------------------
  Name:
  Title:

<PAGE>   17

THE FIRST NATIONAL BANK OF BOSTON, as a Lender

By: /s/ Linda E.C. Alto
   ---------------------------------
  Name:  LINDA E.C. ALTO
  Title: VP

DRESDNER BANK A.G. NEW YORK BRANCH AND GRAND CAYMAN BRANCH, as a
Lender

By:
   ------------------------------
  Name:
  Title:

By:
   ------------------------------
  Name:
  Title:

FIRST BANK NATIONAL ASSOCIATION, as a Lender

By:
   ------------------------------
  Name:
  Title:

EUROPEAN AMERICAN BANK, as a Lender

By:
   ------------------------------
  Name:
  Title:

<PAGE>   18
                                                                               8

ERSTE BANK DER OESTERREICHISCHEN SPARKASSEN AG, GRAND CAYMAN ISLAND
BRANCH, as a Lender

By: /s Rima Terradista                               /s/ John S. Runnion
   --------------------------------------------
  Name: RIMA TERRADISTA                              JOHN S. RUNNION
  Title:   Vice President                            FIRST VICE PRESIDENT

ZIONS FIRST NATIONAL BANK, as a Lender

By:
   -------------------------------------------
  Name:
  Title:

ADVANCED RESEARCH PRESS, INC., as a Grantor

By:
   -------------------------------------------
  Name:
  Title:

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