UPDATED MANNATECH 24 HOUR INFO LINE

UPDATED MANNATECH 24 HOUR INFORMATION LINE

There are further updates to our 24 Hour information line! Sam Caster, CEO and Co-Founder of Mannatech has recorded a fantastic introduction to Mannatech, focusing on Mannatech's key R&D strategies, revolutionary products and technology that includes an awesome overview of the new skin care range as well as important growth strategies of the business.

If you are looking for a way to impress prospects, get them to dial into our 24 Hour Information line to listen to George Howden's, Mannatech's Managing Director for Australia and New Zealand inspirational introduction to Mannatech and the endless opportunities such an amazing company offers, for EVERYONE who wants to take on the challenge and Sam Caster's amazing recording.

All you need to do is dial 02 8437 7403 for Australia and +61 2 8437 7403 for New Zealand then make your selection as follows:

• Select 1 for 24 Hour Information line - new product information and incentive details
• Select 2 for five short business success stories from some of our Silver and above Presidentials
• Select 3 for George Howden, Mannatech's Managing Director, Australia and New Zealand
• Select 4 for Sam Caster, CEO and Co-Founder for Mannatech Inc.

Mannatech Signs Letter of Intent with Carrington

Coppell, Texas (NASDAQ-MTEX) ––December 7, 2006 - Mannatech, Inc. announced today it has signed a non-binding letter of intent dated November 30th with Carrington Laboratories, Inc. to provide a supply of Manapol® powder. Manapol®, derived from the Aloe vera plant, is an original ingredient in Mannatech’s flagship product, Ambrotose®. Under the terms of the letter of intent, Carrington agrees to supply Manapol® powder to Mannatech under a non-exclusive agreement for a period of up to three (3) years. The parties are working to complete the definitive agreement.

Sam Caster, Chairman and Chief Executive Officer of Mannatech, stated “This letter of intent helps secure an uninterrupted source of Manapol®, thus ensuring that we continue to meet the growing associate demand for our patented glyconutrient products. Our glyconutrient patent is another example of how Mannatech provides leading edge science and technology in the Wellness Industry.”

Mr. Caster also commented “As part of our ongoing strategy to strengthen our management team, we have broadened our search for a senior level Vice President of Sales who combines both corporate and industry experience."

About Mannatech, Incorporated

Mannatech, Incorporated is a global wellness solutions provider that develops innovative, high-quality, proprietary nutritional supplements, topical and skin care products, and weight management products that are sold through approximately 536,000 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, 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 may be identified generally by the use of phrases or terminology such as “may,” “believes,” and “will further” 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 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 its expectations, statements, and assumptions reflected in these forward-looking statements are reasonable, it cautions its 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 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.

Investor Relations Contact:

Gary Spinell, Vice President
972.471.6512
ir@mannatech.com

Sam Caster and Mannatech

Samuel L. Caster, Mannatech’s Chairman of the Board, CEO and co-founder, began his professional career as an entertainer and restaurateur. Prior to attending the University of North Texas, he was selected to tour with the internationally known Up with People musical group. The experience with this group prompted the formation of a band, periodic tours and the eventual founding of a small chain of restaurants.

Fascinated by renewable energy products, Sam became part of a direct sales business that achieved annual sales in excess of $50 million. When federal renewable energy credits expired in 1985, Sam used his experience with energy products to create a network marketing company that sold a NASA-developed technology called Radiant Barrier. This company, Eagle Shield, exceeded annual sales of $100 million by its third year.

In 1990, Sam was invited to consult with a company that had evolved out of cancer research. Sam recognized the potential of nutrition in the expanding health industry and set out on a quest to find new, proprietary technology in this field.

In 1994, his search was rewarded with the securing of a license to distribute Manapol® with its patented process that preserves the healing properties of Aloe Vera. This was the key technology that Sam used to open Mannatech. During its third year, Mannatech applied for worldwide patents on Ambrotose®, an exciting and revolutionary nutritional product focused on the discovery of glyconutrients. By the end of the company’s ninth year, total cumulative sales worldwide were in excess of one billion dollars with distribution expanding from the U.S. and Canada to the U.K., Japan, Australia, and New Zealand. The company has since expanded into Korea, Taiwan, Denmark, and Germany as well.

Sam has held various positions since co-founding Mannatech: President, Co-Chairman, Chairman and Chief Executive Officer. Regardless of the position, Sam’s emphasis throughout his career has been in the area of sales and marketing. In this capacity, he created a new compensation plan and successfully managed the transition from a binary system to Mannatech’s global Compensation System.

Sam is also Founder and Chairman of MannaRelief, a 501(c) (3) charitable, not-for-profit organization that distributes the latest glyconutritional products to underprivileged children throughout the world.

Health and Hope to the Children of the World...The future of the world depends upon the children, yet the children’s future depends upon us. Tragically, ten million children under the age of six will die this year from preventable diseases.

Manna Hope Program

The Manna Hope Program provides support for health challenged children ages 18 and under.

Children with critical health needs receive an extensive supply of high-quality glyconutrients and other vital nutrients designed to support their quality of life.

The program sponsorship runs for a six-month period, which may then be renewed.

Manna Blessing Program

Children, especially orphans, are the greatest victims of war, famine and disease.

Through the Manna Blessing Program, MannaRelief assists to provide nutritional supplements to orphans on every continent.

Tragically, global issues such as AIDS and other crises are causing the numbers of orphans to rapidly increase.

Any individual, group, business, church, ministry or civic organization can sponsor an orphan or orphanage through the Manna Blessing program. Additionally, MannaRelief organizes trips to orphanages to visit the children and deliver these essential nutrients.

A Message from Sam and Linda Caster:

We are pleased to present MannaLife, extension of MannaRelief Ministries working with Family Foundations International. MannaLife is a result of our desire to see you come into fulfillment of your life purpose.

We have seen throughout the years so many people dealing predominantly with three life issues. We know that people are drawn to our company because they have identified needs in their health and/or finances. Beyond that, people’s lives are impacted by broken relationships.

We began to look for training around these core life issues and found a Christian ministry, Family Foundations International (FFI), that has tremendous training in these areas.

The more we got to know FFI and its leaders, Craig & Jan Hill, the more we wanted to share these foundational teachings with others through the ministry of MannaLife.