Cardarine, also known as GW501516, is a selective androgen receptor modulator (SARM) that was originally develop for its potential benefits in treating cardiovascular diseases, diabetes, and obesity. However, it has gained popularity in the bodybuilding and fitness communities as a performance-enhancing drug due to its reported ability to increase endurance and fat burning.

Although some studies have suggest that Cardarine may have positive effects on exercise performance, it is not approve for human use and is prohibited by the World Anti-Doping Agency (WADA) and the U.S. Anti-Doping Agency (USADA) due to its potential health risks, including an increased risk of cancer.