4-Hydroxytestosterone
4-Hydroxytestosterone (4-OHT, 4,17beta-dihydroxy-4-androstene-3-one) is a prohormone and anabolic steroid. It was first patented by G.D. Searle & Company in 1955 and is testosterone with a hydroxy group at the four position. 4-OHT has moderate anabolic, mild androgenic, and anti-estrogenic properties and is similar to the steroid clostebol.