In enzymology, a NADPH dehydrogenase is an enzyme that catalyzes In enzymology, a NAD (P)H dehydrogenase (quinone) (EC 1.6.5.2) is an enzyme that catalyzes the chemical reaction NAD (P)H + H+ + a quinone↔ NAD (P)+ + a hydroquinone. The 4 substrates of this enzyme are NADH, NADPH, H+, and quinone, whereas its 3 products are NAD+, NADP+, and hydroquinone.https://www.creative-enzymes.com/product/Native-Bacillus-Megaterium-Diaphorase-NADH-_738.html