Out-of-competition sample on September 24, 2025 tested positive for mesterolone; CSAD investigation found no intentional use and evidence pointed to possible contamination from compounded pharmacy supplements.
View official story →Out-of-competition sample on September 8, 2025 returned positive for testosterone; Usman admitted testosterone and BPC-157 use leading into UFC Rio.
View official story →Three missed tests in 2024 constituted whereabouts failures under the UFC Anti-Doping Policy.
View official story →Two out-of-competition samples in June and July 2025 were positive for Trimetazidine; combined into one violation under UFC ADP rules.
View official story →Out-of-competition samples in June and July 2025 detected meldonium; both adverse findings treated as a single violation.
View official story →Multiple samples in June and July 2025 showed drostanolone, testosterone metabolites, and tamoxifen metabolite; use occurred before UFC signing and was not disclosed.
View official story →February 14, 2025 out-of-competition sample was positive for furosemide; athlete was removed from scheduled bout.
View official story →October 17, 2024 sample showed meldonium; athlete used the substance after joining the UFC registered testing pool.
View official story →January 13, 2025 sample contained anastrozole; second UFC ADP violation after a 2017 case involving the same substance.
View official story →October 8, 2024 sample contained low-level LGD-4033 metabolite traced to a contaminated supplement; sanction set at 180 days.
View official story →August 2024 samples showed exogenous testosterone metabolites including 19-norandrosterone; athlete admitted nandrolone use.
View official story →June 8, 2024 sample detected drostanolone metabolite; athlete failed to disclose prohibited use during UFC onboarding.
View official story →April 11, 2024 sample contained drostanolone metabolite at low level; subsequent samples were negative.
View official story →April–May 2024 samples indicated exogenous testosterone from a contaminated dietary supplement purchased at retail.
View official story →June 21, 2023 sample collected by USADA (before transition to CSAD) showed exogenous testosterone; result reported months later.
View official story →Self-reported use of a supplement containing DHEA led to a positive May 4, 2024 test for exogenous DHEA metabolites.
View official story →February 6, 2024 sample collected by Drug Free Sport International was positive for Dianabol metabolites.
View official story →Samples collected in June, July, and August 2023 showed drostanolone, exogenous testosterone, and later anastrozole after initial notification.
View official story →