Statement on Sean O'Malley

USADA announced today that Sean O’Malley, of Phoenix, Ariz., has tested positive for a prohibited substance and accepted a reduced six-month sanction, consistent with other supplement contamination cases, for his second anti-doping policy violation.

O’Malley, 25, tested positive for ostarine as the result of out-of-competition urine samples he provided on August 6, 2019 and August 12, 2019. His two positives, as well as additional positives collected after August 12, 2019, were treated as a single violation because the estimated concentration of ostarine in the urine samples was consistent with ingestion prior to August 29, 2019, the date O’Malley received notification of his second violation. In addition, the pattern of low urinary ostarine concentrations observed in multiple samples provided by O’Malley was consistent with exposure to ostarine as a contaminant. Ostarine is a non-Specified Substance in the class of Anabolic Agents and prohibited at all times under the UFC Anti-Doping Policy and UFC Prohibited List.

After a thorough investigation into O’Malley’s positive tests, including extensive follow-up testing, his agreement to keep a food log, his increased level of care in selecting supplements, and finding no evidence of intentional use, USADA resolved O’Malley’s case with a six-month period of ineligibility. O’Malley’s period of ineligibility began on August 6, 2019, the date his positive sample was collected.

Ostarine, also known as MK-2866 and Enobosarm, is a selective androgen receptor modulator (SARM) that is illegally sold worldwide as a performance-enhancing substance. Ostarine is not currently available as a prescription medication in any country, and its unauthorized use may carry serious side effects. Nonetheless, ostarine has commonly been found as a declared and undeclared ingredient in many dietary supplements.

More information about the risks of ostarine can be found through a USADA athlete advisory. USADA’s athlete advisory recognizes the demonstrated prevalence of ostarine in a wide range of supplement products used by athletes (see USADA High Risk List for more than 70 products) and that ostarine has frequently been found as a product contaminant.