Drostanolone Propionate or Masteron is probably one of the most interesting steroids used by athletes. It is primarily designated for the treatment of breast cancer patients to inhibit estrogen production. Estrogen is the hormone secreted by female that gives them their distinct sexual characteristics. Maseril, the trademark of Drostanolone Propionate when used in breast cancer therapy is combined with SERM (Selective Estrogen Receptor Modulator). There was a drop in estrogen levels among women who had gone through treatment using this hormone. Masteron had become a favorite steroid among athletes and competitive bodybuilders. It is a pretty popular anabolic steroid. Masteron is a derivative of dihydrotestosterone or DHT which restrains the conversion to estrogen through aromatization. It could be that its ability to inhibit estrogen from interacting with the aromatase enzyme or it blocks the receptor that binds the estrogen that causes this phenomena. Whatever the reason, because of its anti-estrogenic properties it blocks the conversion of free testosterones to estrogen through aromatization. This makes Masteron a common inclusion in a high anabolic cycle. Since compounds used in cycles to achieve mass gains and strengths have very potent testosterone content, Masteron is used to prevent the estrogenic side effects to take place.