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10 November 2026
The ITA reports that a sample collected during an out-of-competition testing mission on 3 September 2026 from Christopher Santiago Reyes Umaña, a mixed martial arts athlete from Nicaragua, has returned an AAF¹ for clostebol metabolites.
Clostebol is prohibited under the WADA Prohibited List as S1. Anabolic Agents. It is banned at all times (in- and out-of-competition) and is classified as a non-specified substance. Clostebol may enhance sports performance by promoting muscle growth, strength, and recovery through its anabolic properties.
The athlete has been informed of the case and has the right to request the analysis of the B-sample.
If the B-sample analysis is requested and confirms the result of the A-sample, the case will be considered as a confirmed anti-doping rule violation. If the B-sample analysis is not requested, the case will also go ahead as a confirmed anti-doping rule violation. The athlete will have the opportunity to present his explanations for the result.
Further, in accordance with the World Anti-Doping Code and Article 7.4.1 of the GAMMA anti-doping rules, a mandatory provisional suspension has been imposed on the athlete. The athlete has the right to challenge the provisional suspension and ask for its lifting.
Pursuant to the GAMMA’s delegation of its anti-doping program to the ITA, the prosecution of the case is being handled entirely by the ITA. Given that the case is underway, there will be no further comments made.
¹ A report from a WADA-accredited laboratory that, consistent with the International Standard for Laboratories, establishes in a sample the presence of a prohibited substance or its metabolites or markers or evidence of the use of a prohibited method.
