Masterlone is an oil based solution of Drostanolone Propionate for IM injection. Drostanolone is an anabolic steroid with significant anabolic and androgenic effects. The fast acting ester produces a rapid increase in serum levels which remain elevated for 2-3 days. Drostanolone promotes significant increases in strength, muscle anabolism, appetite and aggression, and has also been demonstrated to reduce body fat.