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Patent Granted In enzymology, a retinol dehydrogenase (RDH) (EC 1.1.1.105) is an enzyme that catalyzes the chemical reaction retinol + NAD+ \rightleftharpoons retinal + NADH + H+ Sometimes, in addition to or along with NAD+, NADP+ can act as a preferred cofactor in the reaction as well. The substrate of the enzyme can be all-trans- or -cis- retinol. There are at least over 20 different isolated enzymes with RDH activity to date.