Stanozolol, is a synthetic anabolic-androgenic steroid (AAS) which was derived from dihydrotestosterone (DHT). Unlike most injectable AAS, stanozolol is not esterified and is sold as an aqueous suspension, or in oral tablet form. The drug has a high oral bioavailability, due to a C17-alkylation which allows the hormone to survive first-pass liver metabolism when ingested. It is because of this that stanozolol is also sold in tablet form.