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Two such studies explored the abilities of KyoGreen powder for sexual dysfunction in men and women and ArginMax to enhance sexual function in males. While both studies seemed to show positive results, they are rendered virtually useless because neither study used a control group that was administered a placebo for a valid comparison. In June 2007, the FDA announced a final rule establishing regulations for the current good manufacturing practices of dietary supplements, partly due to the 2006 study of sexual enhancement/impotence products.
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