UniProt Summary: Oxidoreductase with a preference for NAD. Oxidizes all- trans-retinol and 13-cis-retinol to the corresponding aldehydes. Has higher activity towards CRBP-bound retinol than with free retinol. Oxidizes 3-alpha-hydroxysteroids. Oxidizes androstanediol and androsterone to dihydrotestosterone and androstanedione. Can also catalyze the reverse reaction. {ECO:0000269|PubMed:10329026, ECO:0000269|PubMed:12534290, ECO:0000269|PubMed:9677409}.