WASHINGTON (AFP) - The US drug safety watchdog warned Monday on its website that several Chinese-made 'dietary supplements' contain the active ingredient found in Viagra, and could be harmful to consumers. "The US Food and Drug Administration (FDA) is advising consumers not to buy or use Super Shangai, Strong Testis, Shangai Ultra, Shangai Ultra X, Lady Shangai, and Shangai Regular, also marketed as Shangai Chaojimengnan, products," the FDA said in a statement. "These products, which originate in China, are being marketed for the treatment of erectile dysfunction and for sexual enhancement," the statement said. None of the product labels mention...