September 30, 2008

Mannatech Continues Commitment to Product Quality With Two Additional Certifications From NSF International

Mannatech, Incorporated (NASDAQ: MTEX), a leading developer and provider of dietary supplements and skin care solutions, today announced that the purity of Mannatech's PLUS(TM) and Ambrotose AO(R) glyconutritional supplements has been certified to show they meet their label claims for ingredients and purity by NSF International, an independent, accredited testing organization. In June, Mannatech received certifications from NSF for its Ambrotose(R) and Advanced Ambrotose(TM) products.

The products were certified according to the NSF/ANSI 173 Dietary Supplement Standard--the only American National Standard for dietary supplements. Mannatech intends to carry the NSF certification mark on the supplements' labels and promotional materials to demonstrate compliance.

"Mannatech is committed to pursuing the highest standards of product quality and science. Not only did we earn NSF certification, but we ensure all our manufacturing partners adhere to Good Manufacturing Practices (GMPs), our industry's standards for ensuring high quality products," said Marika Berkley, vice president of global regulatory affairs and quality assurance for Mannatech. "Customers need to know that our products always meet these high standards and that they will never be compromised."

NSF International--a not-for-profit, public health certification organization--ensures a product's label reflects the contents of the supplement, that all ingredients are openly disclosed on the label and that the product's purity is acceptable. Additionally, NSF assesses each manufacturing site to ensure it complies with GMPs; NSF will not certify a product unless the manufacturer meets all the rigorous audit requirements.

"By obtaining certification for two additional products, Mannatech continues to demonstrate its dedication and commitment to excellence," said Ed Wyszumiala, general manager of NSF's dietary supplements programs.

Mannatech will continue working with NSF to certify additional products in Mannatech's portfolio.

About Mannatech

Mannatech, Incorporated, is a global wellness solutions provider of innovative, high quality, proprietary nutritional supplements, topical and skin care products, and weight management products sold through independent associates and members located in the United States and the international markets of Canada, Australia, the United Kingdom, Japan, New Zealand, the Republic of Korea, Taiwan, Denmark, Germany, and South Africa. For more information please visit or

Please Note: This release contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, Section 21E of the Securities Exchange Act of 1934, as amended, and the Private Securities Litigation Reform Act of 1995. These forward-looking statements generally can be identified by use of phrases or terminology such as "intend" or other similar words or the negative of such terminology. Similarly, descriptions of Mannatech's objectives, strategies, plans, goals or targets contained herein are also considered forward-looking statements. Mannatech believes this release should be read in conjunction with all of its filings with the United States Securities and Exchange Commission and cautions its readers that these forward-looking statements are subject to certain events, risks, uncertainties, and other factors. Some of these factors include, among others, Mannatech's inability to attract and retain associates and members, increases in competition, litigation, regulatory changes, and its planned growth into new international markets. Although Mannatech believes that the expectations, statements, and assumptions reflected in these forward-looking statements are reasonable, it cautions readers to always consider all of the risk factors and any other cautionary statements carefully in evaluating each forward-looking statement in this release, as well as those set forth in its latest Annual Report on Form 10-K and Quarterly Report on Form 10-Q, and other filings filed with the United States Securities and Exchange Commission, including its current reports on Form 8-K. All of the forward-looking statements contained herein speak only as of the date of this release.