Boldenone (INN, BAN) (brand names Equipoise, Ganabol, Equigan, Ultragan, Boldane), also known as Δ1-testosterone, 1-dehydrotestosterone, or androsta-1,4-diene-3-one-17β-ol, is a synthetic anabolic-androgenic steroid (AAS) and the 1(2)-dehydrogenated analogue of testosterone.