Methylstenbolone
Methylstenbolone, known by the nicknames M-Sten, Methyl-Sten, and Ultradrol, is a synthetic and orally active anabolic–androgenic steroid and a 17α-methylated derivative of dihydrotestosterone which was never introduced for medical use. It is a designer steroid and has been sold via the internet marketed as a dietary/nutritional supplement.