Glutathione amide reductase (, GAR) is an enzyme with systematic name glutathione amide:NAD<sup>+</sup> oxidoreductase. This enzyme catalyses the following chemical reaction
The three substrates of this enzyme are glutathione amide disulfide, reduced nicotinamide adenine dinucleotide (NADH), and a proton. Its products are glutathione amide and oxidised NAD<sup>+</sup>. Glutathione amide reductase is a dimeric flavoprotein (FAD).