Tetrahydrogestrinone

Tetrahydrogestrinone (THG) is an anabolic steroid that was specially designed so as to make it undetectable under normal drug testing.

The drug was made public when the United States Anti-Doping Agency was contacted by an anonymous athletics coach who claimed that several top athletes were using THG. The same coach subsequently provided the USADA with a syringe containing THG, which the USADA then used to develop a test for the substance.

The USADA identified the Bay Area Laboratory Cooperative, an american nutritional supplement company, as the source of THG.