Niacin is the generic name for nicotinic acid and nicotinamide, either of which may act as a source of the vitamin in the diet. Nicotinic acid is a monocarboxylic acid derivative of pyridine. Niacin is one of the end products of the kynurenine pathway of tryptophan degradation (a pyridoxal 5 phosphate dependent process). Niacinamide is the amide of niacin and is an essential component of nicotinamide adenine dinucleotide (NAD+) and nicotinamide adenine dinucleotide phosphate (NADH+). Both of which are involved with electron and hydrogen transfer.