FIRST AMENDMENT TO EMPLOYMENT AGREEMENT

Exhibit 10.4

FIRST AMENDMENT TO EMPLOYMENT AGREEMENT

This First Amendment to Employment Agreement (this “First Amendment”), dated as of December 16, 2009, is entered into by and between Mannatech, Incorporated (the “Company”) and Xxxxx X. Xxxxxxx (“Employee”).

RECITALS

This First Amendment amends that certain Employment Agreement, effective as of March 2, 2009, by and between the Company and Employee (the “Employment Agreement”).

STATEMENT OF AGREEMENT

NOW, THEREFORE, in consideration of the foregoing and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereto hereby agree as follows:

1.           The first sentence of Section 1.2 of the Amended Employment Agreement is hereby amended and restated in its entirety to read as follows:

“The Employee shall serve as President Global Business Operations and Expansion of the Company, with the authority, duties and responsibilities described herein and those customarily incident to such office.”

2.           This First Amendment may be executed in multiple counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

3.           This First Amendment and the Amended Employment Agreement and the documents referred to herein and therein constitute the entire agreement among the parties and supersede in all respects any other

              agreement or understanding among the parties.  No party shall be liable or bound to any other party in any manner by any warranties, representations, or covenants except as specifically set forth herein or therein.

4.           In case any one or more of the provisions contained in this First Amendment should be invalid, illegal or unenforceable in any respect, the validity, legality or enforceability of the remaining provisions

              contained herein shall not in any way be affected or impaired thereby.

5.           This First Amendment shall be governed by, and enforced and construed under, the laws of the State of Texas.

[SIGNATURE PAGE FOLLOWS]

IN WITNESS WHEREOF, the parties have executed this First Amendment as of the date first above written.

COMPANY:

MANNATECH, INCORPORATED

By: /s/ Xxxxxx X. Xxxxxxx

Xxxxxx X. Xxxxxxx, Co-Chief Executive Officer and Chief Science Officer

EMPLOYEE:

/s/ Xxxxx X. Xxxxxxx                                                                      

Xxxxx X. Xxxxxxx, President Global Business Operations and Expansion