Former UFC flyweight champion Nicco Montano and highly regarded bantamweight prospect Sean O'Malley were among four fighters to receive six-month suspensions from USADA after testing positive for the banned substance ostarine.
In addition to Montano and O’Malley, UFC fighters Augusto Mendes and Marvin Vettori also received six-month sanctions. After conducting thorough investigations in each case, USADA found no evidence of intentional use of ostarine, a selective androgen receptor modulator sold as a performance-enhancing substance. Ostarine is often found as an undeclared ingredient in many supplements and can be difficult for athletes to identify as the source of their positive test.