In enzymology, a glycerol-3-phosphate dehydrogenase is an enzyme that catalyzes the chemical reaction sn-glycerol 3-phosphate + NAD+ ⇌ {\displaystyle \rightleftharpoons } glycerone phosphate + NADH + H+The two substrates of this enzyme are sn-glycerol 3-phosphate and NAD+, whereas its 3 products are glycerone phosphate, NADH, and H+. Wikipedia