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Many people take a multivitamin daily, or specific vitamins for a particular reason, like Vitamin C to ward off a cold. But a growing body of research shows that, for many people, taking supplements may do nothing at all -- and overdoing it by taking several times the recommended daily allowance can even be harmful. FDA oversight of vitamin supplements is limited, so it's up to consumers to watch what they take. We explore the risks and benefits of taking your vitamins.