Methasterone, also known as Superdrol or methyldrostanolone, is an anabolic androgenic steroid (AAS) that is derived from dihydrotestosterone (DHT). It is a synthetic compound that was initially developed for medical use but is now primarily known for its illicit use in bodybuilding and athletic performance enhancement. It was sold legally for 9 years as a body building supplement. Because of this lengthy time being legal it has more studies and references than most other designer steroids.