Drostanolone Propionate or Masteron is probably one of the most interesting steroids used by athletes. It is primarily intended for the treatment of breast cancer patients to inhibit estrogen production. Estrogen is the hormone secreted by the female that gives them their distinct sexual characteristics. Maseril, the trademark of Drostanolone Propionate when used in the treatment of breast cancer is combined with SERM (Selective Oestrogen Receptor Modulator). There was a decline in estrogen levels in women who had been treated with this hormone. The Masteron had become a favorite steroid among athletes and bodybuilders. It is a very popular anabolic steroid. Masteron is a dihydrotestosterone or DHT derivative that limits conversion to estrogen by aromatization. It may be that its ability to inhibit estrogen interacts with the aromatase enzyme or blocks the estrogen receptor responsible for this phenomenon. Whatever the reason, because of its anti-estrogenic properties, it blocks the conversion of free testosterones into estrogen by aromatization. This makes the Masteron a common inclusion in a high anabolic cycle. Since compounds used in cycles to gain mass gains and strengths have a very potent testosterone content, Masteron is used to prevent estrogenic side effects.