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Dietary supplements were discovered by the Food and Drug Administration Washington to contain undeclared erectile dysfunction drugs. These drugs were marketed to provide sexual enhancement but instead was found to be putting users at risk. FDA warned the public on Chinese made supplements packaged and distributed by Shanghai Distributor of Puerto Rico. Consumers were advised to stay away from supplements sold under the name Super Shangai, Strong Testis, Shangai Ultra, Shangai Ultra X, Lady Shangai and Shangai Regular. Product testing indicated they contain chemical compound sildenafil or one that mimics it which interacts with nitrates in drugs taken for disorder associated with erectile dysfunction, diabetes, high blood pressure, high cholesterol and heart disease. It further warned that safety and purity of the ingredients is unknown. Before taking any Viagra or male sexual enhancements please consult your doctor first or do website research for the effects of its ingredients.
Reference:  http://health.yahoo.com/news/ap/dietary_supplement_warning.html