(See NAD.)

a coenzyme that functions during respiration to produce ATP.

An energy carrier molecule, used directly by enzymes or to shuttle energy to the electron transport system. Synthesized from the vitamin niacin (nicotinic acid).

a coenzyme present in most living cells and derived from the B vitamin nicotinic acid; serves as a reductant in various metabolic processes

An important coenzyme, functioning as a hydrogen carrier in a wide range of redox reactions; the H is carried on the nicotinamide residue. The oxidized form of the coenzyme is written NAD+, the reduced form as NADH (or NADH+H+).

Nicotinamide adenine dinucleotide (NAD+) and nicotinamide adenine dinucleotide phosphate (NADP+) are two important coenzymes found in cells. They play key roles as carriers of electrons in the transfer of reduction potential.