Overdosing On Some Supplements Poses A Cancer Risk

Certain dietary supplements widely available in the U.S. are harmless when taken at triple the recommended dose, but pose a cancer risk if taken at higher doses, a U.S. study has found. Beta-carotene, selenium and folic acid are essential nutrients, and are beneficial and harmless when taken in a certain balance, researchers say. But when taken at much higher doses, as some manufacturers recommend, they have been shown to increase the risk of developing a wide variety of cancers.