Masteron® is a steroid compound that is described chemically as 17β-Hydroxy-2α-methyl- 5α-androstan-3-one Masteron® is a sterile solution of Drostanolone Propionate in Miglyol 840, Ethyl oleate, Benzyl benzoate, Benzyl alcohol. Masteron® is a synthetic derivative of dihydrotestosterone, producing an anabolic effect and promoting protein synthesis as well as creating positive nitrogen balance in humans. Since it is a derivative of dihydrotestosterone, Drostanolone does not aromatize to estrogens. Masteron® has significant anabolic and androgenic properties promoting an increase in strength and growth of muscle tissue while acting as an estrogen antagonist.