Mairbek Taisumov has accepted a six-month suspension from the U.S. Anti-Doping Agency after testing positive for stanozolol, after proving that his supplements were contaminated.
According to USADA on Thursday, Taisumov has been suspended for six months dating back to Oct. 8. After submitting his dietary supplements to USADA, the agency determined that despite not listing the substance on the labels, those substances still contained stanozolol. As such, USADA levied a shorter suspension, which is now over, and Taisumov is eligible to compete again.
Taisumov tested positive after an in-competition test following his decision win over Desmond Green at UFC Fight Night 136 in Moscow in September. The promotion has not yet announced whether the victory will be overturned to a no-contest. Prior to his bout with Green, Taisumov also missed weight by five pounds, but still recorded the victory to extend his win streak to six. Taisumov has not been defeated since losing to Michel Prazeres in 2014, and his decision over Green was the first in that stretch to reach the scorecards.
USADA's statement regarding Taisumov is as follows:
USADA announced today that Mairbek Taisumov, of Vienna, Austria, has accepted a six-month sanction for a violation of the UFC® Anti-Doping Policy after testing positive for a prohibited substance.
Taisumov, 30, tested positive for stanozolol metabolites 3'-hydroxystanozolol-O-glucuronide and 16β-hydroxystanozolol-O-glucuronide as the result of an in-competition urine sample he provided on September 15, 2018 at UFC Fight Night in Moscow, Russia. Stanozolol is a non-Specified Substance in the class of Anabolic Agents and prohibited at all times under the UFC Anti-Doping Policy, which has adopted the World Anti-Doping Agency Prohibited List.
Following notification of his positive test, Taisumov provided USADA with information about dietary supplement products he was using before and at the time of the relevant sample collection. USADA obtained open packages of the dietary supplements and collaborated with the Russian Anti-Doping Agency (RUSADA) to source unopened packages from Russia. Although no prohibited substances were listed on the supplement labels, product analysis conducted on both the open and independently sourced, unopened packages of the products by the WADA-accredited laboratory in Salt Lake City, Utah, indicated that they all contained stanozolol.