COPPELL, TX, Jun 28, 2006 (MARKET WIRE via COMTEX) -- Mannatech, Inc. (MTEX) announced today the addition of Terence O'Day, 57, as Executive Vice President of Global Operations, reporting to Terry Persinger, President and COO. Mr. O'Day will be responsible for all aspects of supply chain operations including global raw materials, contract manufacturing, product warehousing and logistics, global facilities procurement, regulatory affairs, and quality assurance. Prior to joining Mannatech, Mr. O'Day served as Executive Vice President, Refrigerated Foods Group, at ConAgra Foods, Inc. from 2001-2005.

"This new position recognizes Mannatech's tremendous global growth to almost $400 million in annual sales and operations in ten countries," said Terry Persinger. "Further, total supply chain management has become a major focus for Mannatech in order to provide our patented, high quality, unique products efficiently worldwide. Terry O'Day has a terrific senior management background in manufacturing and supply chain operations with world class food and cosmetics companies including Conagra, Revlon, Nabisco and Kraft."

Sam Caster, Chairman and CEO, said, "Mannatech's goal is to make our unique, high quality products available to everyone, everywhere in the world. It is essential that we identify and develop the highest quality sources in every region of the planet. Terry O'Day has the experience, skills and desire to take Mannatech to the next level by providing premiere sources to support our expansion around the globe. We are pleased to have Terry and his wife Susan joining the Mannatech family."

Mr. O'Day holds a BS degree from the U.S. Air Force Academy, an MBA from Western Michigan University, and is a graduate of Columbia University's Transition to General Management executive program. A 23-year veteran of the U.S. Air Force/Air National Guard, Mr. O'Day was awarded two Air Force commendations for outstanding performance.

About Mannatech
Based in Coppell, Texas, Mannatech, Incorporated is a wellness solutions provider that develops innovative, high-quality, proprietary nutritional supplements, topical products and weight management products, which are sold through independent associates and members operating throughout the United States and the international markets of Canada, Australia, the United Kingdom, Japan, New Zealand, the Republic of Korea, Taiwan, Denmark, and Germany.

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 "confidents," and "plans" 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 Securities and Exchange Commission and cautions 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 planned growth. Although Mannatech believes that its expectations, statements, and assumptions reflected in these forward-looking statements are reasonable, but cautions 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 other filings filed with the 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.