COPPELL, Texas--(BUSINESS WIRE)--Mannatech, Incorporated (NASDAQ: MTEX), a global pioneer in the development of high-quality health, weight and fitness, and skin care solutions based on nutritional science, announced winners of its OsoLean® Challenge, an international contest challenging its independent sales Associates in the United States, Canada and South Africa to try OsoLean powder for eight weeks and track the changes in their waists. The top three winners from the U.S. lost a combine
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