Masteron 

Drostanolone Propionate has anti-estrogenic characteristics with little hepatotoxicity and practically zero fluid retention. These anti-estrogenic characteristics make Drostanolone Propionate a safe drug with almost no side effects such as gynecomastia and high blood pressure.
Increases nitrogen retention. It is myotropic, acting in the cytoplasm of the muscle cell, it promotes in the nucleus the release of the enzyme alpha reductase, allowing RNA to take advantage of amino acids and proteins (nitrogen) from the diet to transform them into muscle tissue. It retains calcium, phosphorus, potassium and chlorides.