EXHIBIT D TO AMENDED AND RESTATED
                                          CREDIT AND GUARANTEE AGREEMENT








                         [FORM OF REVOLVING CREDIT NOTE]

THIS  NOTE MAY NOT BE  TRANSFERRED  EXCEPT  IN  COMPLIANCE  WITH THE  TERMS  AND
PROVISIONS OF THE AMENDED AND RESTATED CREDIT AND GUARANTEE  AGREEMENT  REFERRED
TO BELOW.  TRANSFERS OF THIS NOTE MUST BE RECORDED IN THE REGISTER MAINTAINED BY
THE  ADMINISTRATIVE  AGENT  PURSUANT TO THE TERMS OF SUCH  AMENDED AND  RESTATED
CREDIT AND GUARANTEE AGREEMENT.

                                               REVOLVING CREDIT NOTE



$____________                                                New York, New York
                                                              November __, 1996


     FOR  VALUE  RECEIVED,  the  undersigned,  TWIN  LABORATORIES  INC.,  a Utah
corporation  (the  "Borrower"),  hereby  unconditionally  promises to pay to the
order of  ________________  (the "Lender") at the office of The Chase  Manhattan
Bank,  located at 270 Park Avenue,  New York, New York 10017, in lawful money of
the  United  States  of  America  and in  immediately  available  funds,  on the
Termination   Date   the   principal   amount   of   ________________    DOLLARS
($___________),  or,  if less,  the  aggregate  unpaid  principal  amount of all
Revolving Credit Loans made by the Lender to the Borrower pursuant to subsection
2.1 of the Credit  Agreement (as defined below).  The Borrower further agrees to
pay  interest  in like money at such  office on the unpaid  principal  amount of
Revolving  Credit Loans made by the Lender from time to time  outstanding at the
rates and on the dates specified in the Credit Agreement.

     The holder of this Note is authorized  to record on the  schedules  annexed
hereto  and made a part  hereof  or on a  continuation  thereof  which  shall be
attached  hereto  and made a part  hereof  the  date,  Type and  amount  of each
Revolving Credit Loan made by the Lender and the date and amount of each payment
or prepayment of principal thereof,  each conversion of all or a portion thereof
to another Type, each  continuation of all or a portion thereof as the same Type
and, in the case of Eurodollar Loans, the length of each Interest Period and the
Eurodollar Rate with respect thereto. Each such recordation shall, to the extent
permitted by applicable law,  constitute prima facie evidence of the accuracy of
the  information  so  recorded,  provided  that  the  failure  to make  any such
recordation  shall not affect the  obligation  of the  Borrower  to repay  (with
applicable  interest)  Revolving Credit Loans made by the Lender pursuant to the
Credit Agreement (as defined below).


<PAGE>

     This  Note (a) is one of the  Revolving  Credit  Notes  referred  to in the
Amended and Restated Credit and Guarantee Agreement, dated as of the date hereof
(as the same may be amended,  supplemented  or otherwise  modified  from time to
time, the "Credit Agreement"), among Twinlab Corporation, a Delaware corporation
formerly known as TLG Laboratories Holding Corp., the Borrower,  the Lender, the
other banks and financial  institutions  from time to time parties thereto,  The
Bank of New York, as co-agent,  and The Chase Manhattan Bank, as  administrative
agent,  (b) is subject to the  provisions  of the  Credit  Agreement  and (c) is
subject to optional and mandatory  prepayment in whole or in part as provided in
the Credit  Agreement.  This Note is secured and  guaranteed  as provided in the
Loan Documents. Reference is hereby made to the Loan Documents for a description
of the properties and assets in which a security interest has been granted,  the
nature and extent of the security and the  guarantees,  the terms and conditions
upon which the security interests and each guarantee were granted and the rights
of the holder of this Note in respect thereof.

     Upon  the  occurrence  of any one or more of the  Events  of  Default,  all
amounts then remaining  unpaid on this Note shall become,  or may be declared to
be, immediately due and payable, all as provided in the Credit Agreement.

     All parties now and  hereafter  liable with  respect to this Note,  whether
maker,  principal,  surety,  guarantor,  endorser  or  otherwise,  hereby  waive
presentment, demand, protest and all other notices of any kind.

     Unless otherwise defined herein,  terms defined in the Credit Agreement and
used herein shall have the meanings given to them in the Credit Agreement.

     THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE
WITH, THE LAW OF THE STATE OF NEW YORK.         
                                    
                                    
                                    TWIN LABORATORIES INC.
                                    
                                    
                                    
                                    By:
                                       ----------------------------------------
    
                                    Name:
                                         --------------------------------------
  
                                    Title:
                                          -------------------------------------




<PAGE>



                                                                     Schedule A
                                                       to Revolving Credit Note

<TABLE>
<CAPTION>


                 LOANS, CONVERSIONS AND REPAYMENTS OF ABR LOANS



-----------------------------------------------------------------------------------------------------------------------------------
                        Amount                                Amount of ABR Loans
       Amount of     Converted to     Amount of Principal of      Converted to       Unpaid Principal Balance
Date   ABR Loans      ABR Loans         ABR Loans Repaid       Eurodollar Loans          of ABR Loans            Notation Made By
<S>     <C>            <C>                 <C>                    <C>                       <C>                      <C>
-----------------------------------------------------------------------------------------------------------------------------------


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


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


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


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


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


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


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


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


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


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


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


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


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

===================================================================================================================================

</TABLE>

<PAGE>

                                                              Schedule B
                                                       to Revolving Credit Note

<TABLE>
<CAPTION>


      LOANS, CONTINUATIONS, CONVERSIONS AND REPAYMENTS OF EURODOLLAR LOANS



----------------------------------------------------------------------------------------------------------------------------------
                                                                                                              Unpaid   
                                                                                                             Principal 
        Amount of    Amount Converted    Interest Period and  Amount of Principal of Amount of Eurodollar    Balance of
        Eurodollar to or Continued as   Eurodollar Rate with    Eurodollar Loans     Loans Converted to      Eurodollar    Notation
Date      Loans      Eurodollar Loans      Respect Thereto            Repaid               ABR Loans           Loans        Made By
<S>       <C>            <C>                   <C>                   <C>                   <C>                 <C>           <C>

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


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


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


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


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


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


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


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


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


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


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


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


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


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

==================================================================================================================================


</TABLE>