Vitamin B3

Last revised by Daniel J Bell on 2 Aug 2021

Vitamin B3 (niacin or nicotinic acid) is a water-soluble vitamin, part of the vitamin B complex, that is an important part of the coenzyme nicotinamide adenine dinucleotide (NAD+) which is involved in many reactions of cellular metabolism. Vitamin B3 is one of the hematinics.

Related pathology

  • pellagra is the clinical syndrome of niacin deficiency, and may affect the CNS, skin and GI system
  • niacin excess: may be associated with transient symptoms

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