Niacin

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Medical 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.

Medically reviewed by Martin Zipser, MD; Board Certified: Surgery


Quick GuideFat-Burning Foods in Pictures: Blueberries, Green Tea, and More

Fat-Burning Foods in Pictures: Blueberries, Green Tea, and More

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Reviewed on 5/12/2014

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