What is Clostebol? All you need to know about the banned substance Jannik Sinner failed anti-doping tests for
World No. 1 Jannik Sinner recently got involved in a doping controversy after testing positive for Clostebol, a prohibited substance. The International Tennis Integrity Agency (ITIA) and an independent tribunal gave the Italian a clean chit, allowing him to continue his career uninterrupted. Clostebol is an anabolic steroid that helps athletes build muscle mass, train…