Exhibit 99.1

Certifications

I, Mark A. LeDoux, Chief Executive Officer of Natural Alternatives International, Inc., certify that:

1. I have reviewed this annual report on Form 10-K of Natural Alternatives International, Inc.;

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report; and

3. Based on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in the annual report.

Date: September 20, 2002

/s/    MARK A. LEDOUX        

Mark A. LeDoux

Chief Executive Officer