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USANA Health Sciences has promised to supply professional female tennis players with nutritional supplements free from substances banned by the World Anti-Doping Agency, and the Salt Lake City-based company is backing the pledge with a $1 million guarantee. Under terms of a new partnership, USANA will pay any Sony Ericsson WTA tour athlete who tests positive for a substance prohibited by WADA because of her use of USANA products twice her prize money earnings from the prior year, up to $1 million. In a written statement, tennis tour CEO Larry Scott said the guarantee is an important step toward ensuring player health while maintaining strict anti-doping standards. "Up until now, the inability of our players to take vitamins and health supplements without fear of accidentally ingesting a prohibited substance has been a real issue," said Scott. USANA has manufactured nutritional supplements since 1993 and has a history of working with elite athletes, including members of the U.S. and Canadian Olympic Speed Skating Team, the company said. USANA is traded on the NASDAQ exchange under the symbol USNA. - Linda Fantin