Beware when it comes to supplements sold in international stores, flea markets, or online, say researchers at the U.S. Food & Drug Administration. Health scammers often target advertising to people who prefer to shop at nontraditional places, using words such as “natural” to inspire trust. There is no legal definition to words such as this and these claims do not mean that a product is free of hidden drug ingredients or contaminants. Nor does it mean the dosages are safe. Products with the claim, “Made in the USA” are not assured of safety, since it does not guarantee they were made here.