Drostanolone propionate (trade name Masteron) is an anabolic/androgenic steroid which is the propionate ester of drostanolone. It is known to be androgenic and anabolic. It has been successfully used as a breast cancer drug, but because of the high risk of virilization, safer options are prescribed. Drostanolone propionate is used primarily by athletes who need to retain strength while losing mass. It is beneficial to runners and athletes who must remain in a certain weight class.
Masteron is an injectable preparation containing the steroid drostanolone propionate.As a result, the structure of this steroid is that of a moderate anabolic/potent androgen which does not aromatize to estrogen. Water retention and gynecomastia therefore do not come into play with this drug. Masteron may in fact exhibit anti-estrogenic activity in the body, competing with other substrates for binding to aromatase. This would reduce the conversion rate of other steroids, Masteron acting in the same way as the oral steroid Proviron.
Bodybuilders have a strong like for non-aromatizing androgens, and find Masteron very useful in a cutting phase. It is generally used for a number of weeks prior to a competition, in an effort to bring out an improved look of density and hardness to the muscles. As long as body fat percentage is low enough, Masteron should work very well.