An 3beta-sterol that is (22E)-ergosta-5,22-diene substituted by a hydroxy group at position 3beta. It is a phytosterol found in marine algae, fish, and rapeseed oil. ChEBI: Brassicasterol is an 3beta-sterol that is (22E)-ergosta-5,22-diene substituted by a hydroxy group at position 3beta. It is a phytosterol found in marine algae, fish, and rapeseed oil. It has a role as an EC 1.3.1.72 (Delta(24)-sterol reductase) inhibitor, a biomarker, a human metabolite, a plant metabolite, an animal metabolite, an algal metabolite, a sterol biosynthesis inhibitor and a marine metabolite. It is an ergostanoid, a 3beta-sterol, a member of phytosterols and a 3beta-hydroxy-Delta(5)-steroid.