vitamin B3

vitamin B3 Niacin, a water-soluble vitamin, which is a component of coenzymes that are important in body metabolism. Vitamin B3 is found primarily in liver and yeast, and it is easily destroyed by cooking. Deficiency of vitamin B3 causes inflammation of the skin, vagina, rectum, and mouth, as well as mental slowing. Also known as nicotinic acid. The daily adult requirement is 16 milligrams.