Chlorodehydro-methyltestosterone, simply known as Turinabol, Tbol and Oral Turinabol, is an anabolic steroid, created by combining methandrostenolone and clostebol. It was originally used as a medicinal steroid to help develop lean muscle mass in bed-bound hospital patients. It is a modified form of Dianabol (Methandienone) and Clostebol (4-chlorotestosterone).