Document:

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                       THE CIT GROUP/BUSINESS CREDIT, INC.
                        300 South Grand Avenue, 3rd Floor
                          Los Angeles, California 90071

                                   Dated as of
                                 March 29, 2001

Mr. Brian Blechman
Mr. Dean Blechman
Mr. Neil Blechman
Mr. Ross Blechman
Mr. Steve Blechman
c/o Twin Laboratories Inc.
150 Motor Parkway
Hauppauge, NY  11778

                   Re: $15,000,000 Aggregate Letters of Credit

Gentlemen:

This letter agreement (the "Agreement") sets forth the agreement among you
(collectively, the "Blechmans") and us ("Agent") with respect to the one or more
irrevocable standby letters of credit in the aggregate amount of $15,000,000
(the "LCs") to be provided in support of our credit facility to Twin
Laboratories Inc. and its affiliates (the "Companies") to be extended by Agent
and the Lenders thereunder pursuant to that certain Financing Agreement, dated
of even date herewith (the "Financing Agreement"). This Agreement is the
Blechmans Agreement Regarding Letters of Credit as defined in the Financing
Agreement.

           1. General Terms of LCs. The LCs shall be one or more irrevocable
standby letters of credit issued by Citibank, N.A. or such other issuing or
confirming bank as may be acceptable to Agent, in its discretion. The aggregate
face amount of the LCs shall be at least $15,000,000, subject to reduction as
hereinafter set forth. Each LC may provide that, on notice to the issuing bank
executed by Agent and the account party (a "Reduction Notice"), the amount of
such LC will be reduced as provided in such notice.

           2. Draws.(a) The LCs shall provide that Agent may draw on the LCs by
presentation to the issuing bank of a statement, executed by Agent, that it is
entitled under this Agreement to draw against the subject LC in an amount set
forth in such statement.

                    (b) Agent may draw on the LCs upon the occurrence of any of
the following (the "Drawing Conditions"): (1) if all of the Obligations (as
defined in the Financing Agreement) shall have been declared accelerated and due
and owing and such Obligations shall not have been satisfied in full 90 days
after such declaration, Agent may draw against the LCs an amount equal to the
lesser of the amount of such Obligations and the aggregate amount of the LCs;
(2) if Twin Laboratories Inc. ("TLI") or any subsidiary of TLI that is a
significant subsidiary (as such term is defined in Regulations S-X under the
Securities Act of 1933) of TLI shall commence any bankruptcy, insolvency or
similar proceeding under any federal or state law
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March 29, 2001
Page 2 of 6

(or if any bankruptcy, insolvency or similar proceeding under any federal or
state law shall be commenced against TLI or any significant subsidiary of TLI by
creditors of TLI or any such significant subsidiary and such proceeding shall
not have been dismissed or vacated within 60 days of commencement), Agent may
draw against the LCs an amount equal to the lesser of the amount of such
Obligations and the aggregate amount of the LCs; or (3) if an LC is to expire
within 30 days and has not been replaced by an LC in an amount at least equal to
that of the expiring LC, issued by a bank acceptable to Agent, in its
discretion, then Agent may draw against such LC.

                    (c) Agent shall have the right, but no obligation, to make
any draw upon the occurrence of a Drawing Condition, and Agent may make partial
drawings upon the LCs in such amounts as it may determine, in its discretion,
subject to the Drawing Conditions. Agent agrees that it will draw pro rata
(based upon the relative amounts of the LCs) against the LCs in the event Agent
draws for less than the full, aggregate amount of the LCs (other than drawings
contemplated by clause (3) of the preceding sentence). Agent agrees that the
proceeds of all drawings against the LCs will be applied to the Obligations
pursuant to the terms of the Financing Agreement.

           3. Reductions. Agent agrees that the aggregate amount of the LCs will
be reduced as follows:

                    (a) For the period beginning September 1, 2001 through March
1, 2002, on the first day of each month, the LCs shall be reduced by the amount
that the "Average Daily Excess Availability" (as defined below) exceeds
$10,000,000; provided however, in no event shall the LCs be reduced more than
$2,000,000 in any single month or more than $7,500,000 in the aggregate pursuant
to this sentence. For the purposes hereof, "Average Daily Excess Availability"
shall mean, as of the date of determination, the average daily excess
availability under the Financing Agreement as calculated by Agent in accordance
with the terms of the Financing Agreement for the immediately prior 60 calendar
days.

                    (b) For the period after March 1, 2002, no reductions in the
LCs will be permitted until Agent receives Twinlab Corporation's audited
December 31, 2001 financial statements. Upon receipt of such year-end financial
statements, the Financing Agreement provides for a reserve against availability
of $5,000,000. If EBITDA (as defined in the Financing Agreement) as reported in
such December 31, 2001 audited year-end financial statements is greater than
$15,000,000, the LCs shall be reduced one-time by the amount that excess
availability as calculated by Agent in accordance with the terms of the
Financing Agreement (which requires that all of the Companies' debts and
obligations are current, and that all of the Companies' payables are being
handled in the normal course of the Companies' business, consistent with their
past practice), as of the date of delivery to Agent of such audited December 31,
2001 financial statements (after giving effect to the $5,000,000 reserve against
availability referred to in the second sentence of this paragraph) exceeds
$10,000,000; provided however, in no event shall the LCs be reduced more than
$4,000,000 pursuant to this paragraph.
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March 29, 2001
Page 3 of 6

                    (c) Beginning on April 1, 2002 and thereafter, on the first
day of each month, the LCs shall be reduced by the amount that the "Average
Daily Excess Availability" exceeds $15,000,000; provided however, in no event
shall the LCs be reduced more than $2,000,000 in any single month pursuant to
this paragraph and for purposes of calculating "Average Daily Excess
Availability" during such period, Agent shall not include the $5,000,000
availability reserve described in the foregoing paragraph.

                    (d) Notwithstanding the foregoing provisions of this Section
3, in no event shall the LCs be reduced to an amount less than $3,500,000
without Agent's prior written consent.

                    (e) Agent will execute and deliver such Reduction Notices to
the issuing bank(s), as and when necessary, to effect the reductions described
above. Each reduction of LCs shall be applied to each of the LCs on a pro rata
basis (based upon the relative amounts of the LCs).

           4. Reimbursement Agreements. Agent agrees that the Companies may
enter into one or more reimbursement agreements (the "Reimbursement Agreements")
with the Blechmans pursuant to which, among other things, (a) the Companies will
agree to reimburse the Blechmans for their costs and expenses in connection with
obtaining and maintaining the LCs and for any drawings against the LCs and (b)
the obligations of the Companies under the Reimbursement Agreements (but only
such obligations) will be secured by liens on assets of the Companies junior and
subordinate to Agent's liens on such assets as provided in an intercreditor
agreement in form and substance substantially identical to the Intercreditor
Agreement, dated of even date herewith, between Agent and Dean and Ross
Blechman. The terms of the Reimbursement Agreements must be reasonably
satisfactory to Agent.

           5. Notices. Whenever it is provided herein that any notice, demand,
request, consent, approval, declaration or other communication shall or may be
given to or served upon any of the parties by any other parties, or whenever any
of the parties desires to give or serve upon any other parties any communication
with respect to this Agreement, each such notice, demand, request, consent,
approval, declaration or other communication shall be in writing and shall be
deemed to have been validly served, given or delivered (a) upon the earlier of
actual receipt and three (3) business days after deposit in the United States
Mail, registered or certified mail, return receipt requested, with proper
postage prepaid, (b) upon transmission, when sent by telecopier or other similar
facsimile transmission (with such telecopy or facsimile promptly confirmed by
delivery of a copy by personal delivery or United States Mail as otherwise
provided in this section), (c) one business day after deposit with a reputable
overnight courier with all charges prepaid, or (d) when delivered, if
hand-delivered by messenger, all of which shall be addressed to the party to be
notified and sent to the address or facsimile number as follows:
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March 29, 2001
Page 4 of 6

If to Blechmans, to:

c/o Twinlab Corporation
150 Motor Parkway
Hauppauge, NY  11778
Telephone:  (631) 647-3140
Telecopier:  (631) 630-3474

If to Agent, to:

The CIT Group/Business Credit, Inc.
300 S. Grand Avenue, 3rd Floor
Los Angeles, CA  90071
Attention:  Regional Manager
Telephone:  (213) 613-2505
Telecopier:  (213) 613-2501

The giving of any notice required hereunder may be waived in writing by the
party entitled to receive such notice.

           6. Costs and Attorneys' Fees. If any action, suit or proceeding is
commenced by or between any of the parties in connection with this Agreement,
the prevailing party shall be entitled to recover from the other any costs,
expenses or attorneys' fees incurred in connection therewith.

           7. Successors and Assigns. This Agreement shall be binding on, and
shall inure to the benefit of, the parties and their respective successors and
assigns (including, in the case of any bankruptcy or similar proceeding, any
receiver, assignee for the benefit of creditors, trustee or debtor in possession
on behalf of such person), except as otherwise provided herein. This Agreement
is freely assignable at any time by Agent (or any Lender with respect to its
rights hereunder) and is not assignable by the Blechmans, provided that any such
assignment by Agent or such Lender is in conjunction with the assignment in
whole or in part of the Obligations in accordance with the terms of the
Financing Agreement, and that such assignment is subject to the terms of this
Agreement.

           8. Integrated Agreement. This Agreement sets forth the entire
understanding of the parties with respect to the matters set forth herein and
may not be modified or amended except in a writing signed by all parties.

           9. Interpretation. The captions in this Agreement are for convenience
of reference only, do not constitute a part of this Agreement and are not to be
considered in construing or interpreting this Agreement. All section, preamble,
recital, exhibit, schedule, disclosure
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March 29, 2001
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schedule, annex, clause and party references are to this Agreement unless
otherwise stated. No party, nor its counsel, shall be deemed the drafter of this
Agreement for purposes of construing the provisions of this Agreement, and all
provisions of this Agreement shall be construed in accordance with their fair
meaning, and not strictly for or against any party.

           10. Authority. Each of the signatories hereto certifies that such
party has all necessary authority to execute this Agreement.

           11. Counterparts. This Agreement may be executed in two or more
counterparts and by facsimile, each of which shall be deemed an original, but
all of which together shall constitute one instrument.

           12. GOVERNING LAW. IN ALL RESPECTS, INCLUDING ALL MATTERS OF
CONSTRUCTION, VALIDITY AND PERFORMANCE, THIS AGREEMENT SHALL BE GOVERNED BY, AND
CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF
CALIFORNIA APPLICABLE TO CONTRACTS MADE AND PERFORMED IN THAT STATE (WITHOUT
REGARD TO THE CHOICE OF LAW OR CONFLICT OF LAW PROVISIONS THEREOF) AND ANY
APPLICABLE LAWS OF THE UNITED STATES OF AMERICA.

           13. WAIVER OF JURY TRIAL. EACH OF THE BLECHMANS AND AGENT WAIVES THE
RIGHT TO A TRIAL BY JURY IN ANY ACTION UNDER THIS AGREEMENT OR ANY ACTION OR
ACTIONS ARISING OUT OF THE TRANSACTIONS CONTEMPLATED HEREBY, REGARDLESS OF WHICH
PARTY INITIATES SUCH ACTION OR ACTIONS.

[REMAINDER OF PAGE INTENTIONALLY BLANK]
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March 29, 2001
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Please indicate your acceptance of the foregoing by signature below.

Sincerely,

THE CIT GROUP/BUSINESS CREDIT, INC.

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

[BLECHMANS SIGNATURES TO BE NOTARIZED]

ACCEPTED AND AGREED:

-----------------------
Brian Blechman

-----------------------
Dean Blechman

-----------------------
Neil Blechman

-----------------------
Ross Blechman

-----------------------
Steve Blechman

STATE OF                       )
                               )
COUNTY OF                      )

On ---------, 2001, before me, the undersigned, a notary public in and for said
State, personally appeared known to me to be Mr. Brian Blechman, Mr. Dean
Blechman, Mr. Neil Blechman, Mr. Ross Blechman, and Mr. Steve Blechman who
executed the within instrument.

WITNESS MY HAND AND OFFICIAL SEAL.

NOTARY PUBLIC<PAGE>   1
                             STOCK PLEDGE AGREEMENT
                                 (CO-BORROWERS)

To: THE CIT GROUP/BUSINESS CREDIT, INC.

Address: 300 South Grand Ave., 3rd Floor
         Los Angeles, CA  90071

                                 March 29, 2001

Gentlemen:

Reference is made to a certain Financing Agreement dated of even date herewith,
as amended (herein called the "Financing Agreement") between you and the
undersigned (each a "Company" and collectively, the "Companies"). Capitalized
terms used herein and defined in the Financing Agreement shall have the same
meanings as set forth therein unless otherwise specifically defined herein. As
security for: the full and indefeasible payment and performance when due of all
now existing and future Obligations of the Companies to you, whether absolute or
contingent, however acquired by you, and whether arising under the Financing
Agreement as now written or as amended or supplemented or augmented hereafter,
or by virtue of any guaranty now or hereafter executed by any Company in your
favor, in law or otherwise (all of which are herein called the "Secured
Obligations"), each Company hereby pledges, assigns, transfers, delivers and
sets over to you all of its right, title and interest in and to the securities
listed on the attached schedule, issued as indicated on said schedule (the
"Securities").

This pledge includes all right, title and interest in and to and a continuing
lien upon and security interest in, all of said Securities together with any and
all rights, coupons, warrants or rights to subscribe, options, dividends,
liquidating dividends, splits, dividends paid in stock, dividends paid in
Securities, new or reclassified Securities, or any other property which such
Company is or may hereafter become entitled to receive on account of such
Securities, any and all increments, substitutions, additions or replacements
thereof, and any and all proceeds thereof (all collectively hereinafter referred
to as the "Pledged Collateral").

This Stock Pledge Agreement is executed as an inducement to you to make loans or
advances to the Companies or issue guaranties at the request of the Companies,
or otherwise to extend credit or financial accommodations to the Companies or to
enter into or continue a financing arrangement with the Companies, and is
executed in consideration of your doing or having done any of the foregoing.

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Each Company agrees that any of the foregoing shall be deemed to have been done
or extended by you in consideration of and in reliance upon the execution of
this Stock Pledge Agreement.

The Companies shall be in default under this Pledge Agreement upon the
occurrence of any Event of Default under the Financing Agreement (herein any
such default shall be referred to as an "Event of Default").

In the event of the happening of any such Event of Default, then on ten (10)
days prior notice to the Companies, without the curing of such default within
such time, you may, to the extent permitted by applicable law, without demand of
performance, advertisement or notice of intention to sell, or of the time or
place of sale, and without notice to redeem, or other notice or demand
whatsoever to or upon the Companies (all and each of which demands,
advertisements and/or notices are hereby expressly waived), forthwith or at any
time or times thereafter during the continuance of such Event of Default,
transfer to and/or register in your name, or the name of your nominee, any or
all of the Pledged Collateral and/or collect, receive, appropriate and realize
upon said Pledged Collateral. In addition, to the extent permitted by applicable
law, and also without any of the aforesaid demands, advertisements, and/or
notices, upon the occurrence of any Event of Default as defined herein, you may
sell, assign, transfer and deliver the whole or any part of the Pledged
Collateral then held by you under this Stock Pledge Agreement or subject to this
Stock Pledge Agreement in one or more parcels, at public or private sale or
sales, at any Exchange Broker's Board, at your office or elsewhere, on such
terms and conditions, and at such prices as you may deem advisable, for cash,
upon credit, or for future delivery, with the right on your part to become the
purchaser thereof at any such sale or sales, free and clear of any right to
equity of redemption (which right or equity is hereby expressly waived and
released). Any notice of sale, disposition, or other intended action by you
required by applicable law and sent to the Companies at least ten (10) days
prior to such action shall constitute reasonable notice to the Companies. Prior
to exercising your rights contained herein you may in your discretion forward
the various coupons coming due on any bonds covered hereby directly to the
Companies for collection.

Net proceeds of any such disposition as aforesaid, after deduction all costs,
including reasonable attorney's fees and expenses of every kind incurred
therein, shall be applied to the payment in whole or in part, in such order as
you may elect, of any of the Secured Obligations, whether then due or not due.
You agree to pay over and return any remaining balance to the Companies or to
any person entitled thereto, upon proper demand being made therefor, and if
there be any deficiency, the Companies shall continue to be fully liable for
same.

Further, you are hereby expressly granted the right and irrevocable proxy, in
the event of the happening of any Event of Default (as defined herein), and on
ten (10)

                                       2
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days prior notice to the Companies, without the curing of such Event of Default
within such time, to transfer to yourself or to your nominee any or all of the
Pledged Collateral or to register same in your name on the books of the company
or entity issuing same; to receive cash dividends, coupons and income thereon
and to hold the same as additional collateral security hereunder, or to apply it
against the Secured Obligations and to exercise any voting rights with respect
to said Collateral for any purposes as you in your discretion deem advisable,
and to otherwise exercise as to such Pledged Collateral, all rights, powers and
remedies as the owner thereof.

Each Company hereby represents and warrants that the Pledged Collateral is owned
by one or more of the Companies absolutely, and is free and clear of all liens
and encumbrances except for the pledge in your favor and except for Permitted
Encumbrances (as defined in the Financing Agreement); that, except for
restrictions under applicable securities law, there are no restrictions upon the
pledge or transfer of any of the Pledged Collateral; that one or more of the
Companies has full right to pledge and transfer the same in accordance with the
terms and conditions of this Stock Pledge Agreement, free of all encumbrances
(except said Permitted Encumbrances) and without the consent of any other
person, firm, entity or corporation and without the need to notify the issuing
company and/or obtain their consent to the pledge; and that said Pledged
Collateral is not subject to any assessment. Each Company agrees to defend its
title to the Pledged Collateral at its own cost and expense, and to pay, satisfy
and discharge and any all assessments, liens or charges now or thereafter placed
upon the Pledged Collateral.

Each Company recognizes that you may be unable to effect a public sale of any or
all of the Collateral, by reason of certain prohibitions contained in the
Securities Act of 1933 and applicable state securities law or otherwise, and may
be compelled to resort to one or more private sales thereof to a restricted
group of purchasers which will be obligated to agree, among other things, to
acquire such securities for their own account for investment and not with a view
to the distribution or resale thereof. Each Company acknowledges and agrees that
any such private sale may result in prices and other terms less favorable to you
than if such sale were a public sale and agrees that such circumstances shall
not, in and of themselves, result in a determination that such sale was not made
in a commercially reasonable manner. You shall be under no obligation to delay a
sale of any of the Pledged Collateral for the period of time necessary to permit
the issuer to register such securities for public sale under the Securities Act
of 1933, or under applicable state securities laws, even if the issuer agrees to
do so.

Each Company affirms and certifies that the Secured Obligations were not, and
will not be, incurred for the purpose of providing or obtaining any credit for
purchasing or trading in registered equity securities or other marketable
securities.

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<PAGE>   4
Each Company hereby agrees at your request to execute all necessary stock powers
in blank, to have the signatures on said powers guaranteed, to execute a letter
or other form confirming that the Pledged Collateral is not being pledged to you
for the purpose of providing or obtaining any credit for purchasing or trading
in registered equity securities or other marketable securities, and to execute
any further documents or papers whatsoever reasonably requested by you in order
to carry out the intent and purpose of this Stock Pledge Agreement.

The pledge provided for herein shall be in addition to, and shall not be deemed
to affect, modify or limit any other rights, collateral, agreements or security
which you may now or hereafter hold whether granted or given to you by the
Companies or by any other person, firm or corporation.

It is understood and agreed that the rights and remedies herein enumerated are
not intended to be exhaustive but are in addition to any other rights or
remedies at law or in equity. You shall have the absolute right in your sole
discretion to determine the order in which your rights and remedies are to be
exercised, and your exercise of any right or remedy shall not preclude the
exercise of any other rights or remedies or be deemed to be a waiver thereof. No
act of forbearance, or agreement to forebear the enforcement of, or extension of
the date of maturity of, any Secured Obligation, shall in any way constitute a
release of, or a waiver or relinquishment of any of your rights or remedies.

This Stock Pledge Agreement is to be governed by the laws of the State of
California shall be binding on the heirs, administrators, executors, successors
and assigns of the Companies, and shall inure to the benefit of you and your
successors and assigns.

[REMAINDER OF PAGE INTENTIONALLY BLANK]

                                       4
<PAGE>   5
     Very truly yours,

TWIN LABORATORIES INC.,
a Utah corporation

By: __________________________
Title:

ADVANCED RESEARCH PRESS, INC.,
a New York corporation

By: __________________________
Title:

CHANGES INTERNATIONAL, INC.,
a Florida corporation

By:_________________________
Title:

PR NUTRITION, INC.,
a  California corporation

By:_________________________
Title:

HEALTH FACTORS INTERNATIONAL, INC.,
a Delaware corporation

By:_________________________
Title:

BRONSON LABORATORIES, INC.,
a Delaware corporation

By:_________________________
Title:

                                       5
<PAGE>   6
                       SCHEDULE TO STOCK PLEDGE AGREEMENT

Issuer                    Owner                            Certificate #

              # of Shares

                                       6

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