WBC Clean Boxing Program Adverse Analytical Finding – Jaime Munguía

 On May 28, 2025, VADA notified Jaime Munguía and the WBC of an adverse analytical finding consistent with the exogenous origin presence of testosterone and its metabolites in a urine sample collected from him on May 4, 2025.  The results of testing Mr. Munguía’s B Sample contents confirmed the Adverse Finding.  Mr. Munguía had never tested positive for any banned substance in any of the over 100 tests he had undergone during his boxing career. So, the WBC considered the Adverse Finding to be a first offense.

The WBC considered the following facts to be extenuating circumstances with respect to the measures taken in his case:(a) Mr. Munguía presented a large portfolio of evidence in support of his position that the Adverse Finding was a false positive, including hair and nail sample testing as well as non-deceptive results of a polygraph test; (b) his and his team’s cooperative and forthcoming postures; and (c) he agreed to abide to the provisions of an Adjudication Agreement into which he and the WBC entered.

Mr. Munguía’s primary defense was that: (1) he had unintentionally and unknowingly consumed at least 4 supplements which were contaminated with pregnenolone; and (2) his unknowing ingestion of pregnenolone-contaminated supplements explained the Adverse Finding.

There are scientific papers, some of which Mr. Munguía provided to the WBC, that can be interpreted as supporting his position. However, there are also scientific publications that suggest that ingestion of pregnenolone is not considered a valid justification for Mr. Munguía’s Adverse Finding.

In light of the contrary views of the effect of ingesting pregnenolone in an adverse analytical finding using IRMS, the WBC Results Management considered Mr. Munguía’s defense and could not determine with reasonable certainty the ultimate causal source of the Adverse Finding.

In the spirit of fair and expeditious resolution, the WBC and Mr. Munguía agreed that Mr. Munguía shall: (1) be place on probation for one (1) year from the date of the sample collection; (2) undergo additional random anti-doping testing during the probationary period at his own expense; (3) pay for and participate in a program designed and conducted by the WBC Nutrition Committee; and (4) be suspended indefinitely without further inquiry if he tests positive during his probationary period.