Trenbolone is a synthetically produced drug from the group of anabolic steroids with moderately androgenic and strongly anabolic effects. Trenbolone is no longer of any importance in human medicine. It is used as a doping agent to build muscle and improve performance. As a derivative of nandrolone, it is a male sex hormone.
Trenbolone was first synthesized in France in 1963 by the scientist Leon Valluz and colleagues on behalf of the pharmaceutical company Roussel Uclaf (now Sanofi).
In human medicine, Trenbolone was officially launched in 1987. The French pharmaceutical company Negma Laboratories introduced it under the brand name Parabolan. In 1997 Negma Laboratories stopped production. Parabolan is the only trenbolone-containing preparation ever approved for humans.