Masteron was once a widely popular anabolic and androgen synthetic steroid among bodybuilders. It was manufactured by a European Pharmaceutical company but the widespread abuse and the concern for toxicity led the company to discontinue is production nearly 2 decades ago.
The steroid is no longer available and even on the black market, its authenticity is questionable. The Belgium Pharmaceutical Company, Sarva Syntex, stopped the manufacture of this drug at least 10 year ago.
Masteron can increase muscle mass and cause a positive nitrogen balance. The body mass is increased gradually over a period of 4-6 weeks.
Masteron does not undergo aromatization to estrogen and that is why it was preferred to many of the other anabolic steroids. It resembles testosterone in its actions. However, at high doses the drug is converted to some degree to estrogen and can lead to development of breast enlargement and water retention. The drug was never approved for clinical use in medicine because of the concern for side effects. In Europe the drug was tried out as a treatment for resistant anemias and individuals with HIV who had profound weight loss.