Masteron is a Dihydrotestosterone derivative, which prevents it from being aromatized into Estrogen by the aromatase enzyme. This is the enzyme responsible for the conversion of androgens into Estrogen . Furthermore, Masteron has been found to be a proven moderate aromatase inhibitor, serving to disable the aromatase enzyme and reduce Estrogen levels as a result. Therefore, one can expect very solid lean muscle gains without any water retention, and minimal fat gain/retention (provided the user has accompanied their cycle with an appropriate diet). The primary purpose of Masteron among athletes and bodybuilders is to exert its aesthetic e enhancing effects of the removal of subcutaneous water retention (due to its anti-aromatase and anti-estrogen activity). Masteron serves as a very poor mass builder with its moderate anabolic strength rating. It is best utilized stacked with other compounds, as Masteron itself is not that much stronger than Testosterone , and in some cases may be weaker. However, when stacked with Testosterone or any other anabolic steroids, it serves to contribute a couple of amazing features to any cycle that makes the other compounds it is stacked with more powerful.