Niacin is a vitamin B complex. Its main function is in metabolic pathways, especially those involved in making energy for the body. It is also useful in the making of fatty acids. A deficiency in niacin results in Pellagra, which signs are inflammation of the skin, diarrhea, dementia, dermatitis, and hallucinations.

recommendation: 15-19 mg for men, 13-15 for women.
foods in: mushrooms, wheat bran, tuna, chicken, and peanuts.

Nicotinic Acid, a member of the vitamin B-complex, C5 H4 NCOOH, occurring in living cells as an essential substance for growth and synthesized for use in treating pellagra.