First Amendment to License Agreement between Natural Alternatives International, Inc. and Compound Solutions, Inc.

Exhibit 10.33

FIRST AMENDMENT TO

AGREEMENT TO LICENSE

This First Amendment (“Amendment”) to the Agreement to License by and between Natural Alternatives International, Inc., a Delaware corporation (“NAI”), and Compound Solutions, Inc., a California corporation (“CSI”), dated effective as of July 1, 2011 (“Agreement”), is made and entered into effective as of January 6, 2012 (“Effective Date”). Unless otherwise defined herein, capitalized terms shall have the meanings given them in the Agreement.

1. The License Agreement attached to the Agreement as Exhibit B is hereby replaced in its entirety with the License Agreement attached hereto.

2. Except as set forth herein, all other terms and conditions of the Agreement shall remain in full force and effect.

3. This Amendment may be executed in any number of counterparts, each of which when so executed and delivered shall be deemed an original, and such counterparts together shall constitute one instrument. Delivery by facsimile or other electronic means of an executed counterpart hereof shall have the same force and effect as delivery of an originally executed counterpart hereof.

[Signatures on following page.]

IN WITNESS WHEREOF, the undersigned have executed this Amendment as of the Effective Date.