Glucose-6-phosphate dehydrogenase (G6PD or G6PDH) (EC 1.1.1.49) is an cytosolic enzyme that catalyzes the chemical reaction: D-glucose 6-phosphate + NADP+ 6-phospho-D-glucono-1, 5-lactone + NADPH + H+. This enzyme is in the pentose phosphate pathway (see image), a metabolic pathway that supplies reducing energy to cells (such as erythrocytes) by maintaining the level of the co-enzyme nicotinamide adenine dinucleotide phosphate (NADPH).http://www.creative-enzymes.com/product/Native-Bakers-Yeast-S-Cerevisiae-Glucose6phosphate-Dehydrogenase_815.html