By Harvey B. Simon, M.D.Harvard Health LettersQUESTION: I hope you can clear up some family confusion. My doctor gave me a prescription for Niaspan, but my wife found the same medication, niacin, at the supermarket at a much lower price. Is it a drug or a vitamin?ANSWER: Niacin is a natural substance -- in fact, it's vitamin B3. Like other vitamins, it's required to keep the metabolism working
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