Definition of Niacin
Niacin: Nicotinic acid, one of the B-complex vitamins-B 3. Deficiency of niacin in the diet results in the disease pellagra. See: Pellagra.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 5/12/2014
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Medically reviewed by Martin Zipser, MD; Board Certified: Surgery
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