"We are pleased to have completed the sale of Pechiney
Electrometallurgie.

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Six of these glyconutrients,
however , are deficient in our modern diet, so Mannatech scours the world to
find new and better sources of the missing nutrients.

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PEM employs more than 1,200 people in France and South Africa and
recorded net sales of approximately Euro 300 million in 2004. With world-class
operations in primary aluminum, fabricated aluminum as well as flexible and
specialty packaging, aerospace applications , bauxite mining and alumina
processing, today's Alcan is well positioned to meet and exceed its customers '
needs for innovative solutions and service."
Founded in 1993, Mannatech is a leading wellness company and a pioneer in
the field of glyconutritional research and development.

About Mannatech, Incorporated
Mannatech, based in Coppell, Texas, is a wellness solutions provider that
sells its products through a global network-marketing system throughout the
United States and the international markets of Canada, Australia, the United
Kingdom, Japan, New Zealand, Republic of Korea, Taiwan and Denmark.

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Medical research has found that eight glyconutrient sugars are needed at
the cellular level for proper immune function. Media may contact Alan A.

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MONTREAL, June 1 - Alcan Inc.
Initially announced in December 2004, the transaction will generate net
proceeds , net of closing adjustments, of approximately Euro 120 million.

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At Ferroatlantica, PEM has found a good home and we wish
the business future success," said Cynthia Carroll, President and Chief
Executive Officer, Alcan Primary Metal Group.

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, a leading European
ferroalloys and independent electrical power producer based in Spain.

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Alcan is a multinational, market-driven company and a global leader in
aluminum and packaging, as well as aluminum recycling.

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The company announced
a ground-breaking discovery in 1996 after formulating a nutritional supplement
comprised of a unique blend of plant -based sugars, which are also referred to
as glyconutrients ('glyco' is the Greek word for 'sweet . The effort has
culminated in the Ambrotose complex.mannatech.

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"The completion of this sale is
aligned with Alcan's objective of focusing on our primary aluminum business,"
she added. "These patents validate our commitment to protecting
our investments in intellectual property.

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We will continue to invest in
research and development to ensure our line of products always represents the
latest technology and science.

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Today Mannatech has more than two dozen glyconutritional products for
adults and children that address issues such as health and nutrition, sports
performance, weight management and skin care.

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Argentina Becomes 20th Country to Issue a Patent for Technology Related to Mannatech's Glyconutritional Ambrotose Complex

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Alcan employs 73,000 people and
has operating facilities in 55 countries and regions.

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L. AR009037B1 will remain in effect until August 2017. For
additional information about Mannatech, please visit its corporate Web site:
http: //www.

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Argentine Patent No.

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Alcan completes sale of its ferroalloy division

This transaction was subject to the consultation of French workers
representatives and merger control clearance from Spanish, German, US and
South African competition authorities.

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The company now holds patents for technology related to the Ambrotose complex
in Argentina, Australia, France, Germany, Hong Kong, Ireland, Italy,
Liechtenstein , Malaysia, Mexico, New Zealand, the Philippines, Singapore,
South Africa, South Korea, Spain, Switzerland , Taiwan, the United Kingdom and
the United States.
"Our stature as a global leader in glyconutrition is strengthened each
time we receive a new patent," said Sam Caster, Mannatech's founder, CEO and
chairman of the board.

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(NYSE, TSX: AL)
announced today that it has completed the sale of its ferroalloy division,
Pechiney Electrometallurgie (PEM), to Ferroatlantica, S. COPPELL, Texas, Argentina has become the 20th
country to issue a patent to Mannatech, Incorporated (Nasdaq: MTEX), for
technology related to the company's Ambrotose complex, a proprietary blend of
plant-based nutrients formulated to support the body's immune system. Van Zelfden at
972-471-7334 or by e-mail at pr@mannatech.com .