Ads often tout dietary supplements and vitamins as "natural" remedies. But studies show megadoses of some vitamins can actually boost the risk of heart disease and cancer, warns Dr. Paul Offit. hide caption

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The trade in dried geckos, such as these from Indonesia, is on the rise amid growing demand for their use as an ingredient in medicinal and skin care products in Asia. Ulet Ifansasti/Getty Images hide caption

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