Introduction: Niacinamide is an amide of niacin. It is the active form of the vitamin. Niacin is converted to niacinamide predominantly in liver. Other body tissues are also capable to amide conversion. Both the forms of vitamin are heterocyclic aromatic compound. They are collectively called Vitamin B3. Yeast, milk, fish, eggs, green vegetables, beans and cereal grains are rich sources of this vitamin. People whose diet is solely based on staple food like corn, are likely to suffer from niacin deficiency. Tryptophan is a substrate for in vivo synthesis of niacin, and this amino acid is deficient in corn. Continue reading...