niacin

A white crystalline acid, C₆H₅NO₂, of the vitamin B complex that is found in meat, wheat germ, dairy products, and yeast and is used to treat and prevent pellagra.

A B vitamin (vitamin B5) essential for the normal function of the nervous system and the gastrointestinal tract. Called also nicotinic acid and antipellagra vitamin. Chemical formula C6H5NO2, chemically it is 3-pyridinecarboxylic acid.

A water–soluble vitamin, a component of vitamin B complex, found in meat, yeast, and dairy products; it is essential to metabolism.

a B vitamin essential for the normal function of the nervous system and the gastrointestinal tract