Top 10 ranked UFC Strawweight contender suspended for failed drug test

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Busted!

No. 7-ranked Ultimate Fighting Championship (UFC) Strawweight contender Iasmin Lucindo was expected to face Gillian Robertson at UFC Vegas 112 on Dec. 13, 2025, but she has been forced out of the bout after failing a drug test, her team told ESPN.

As a result, Lucindo has been suspended by both the Nevada State Athletic Commission (NSAC) and Combat Sports Anti-Doping, the UFC’s drug-testing partner.

The Brazilian tested positive for Mesterolone — an oral androgen and anabolic steroid medication primarily used to treat conditions in men, such as low testosterone levels and hypogonadism, according to the National Institutes of Health.

Lucindo’s manager released a statement to MMAJunkie on Wednesday (Nov. 19, 2025), stressing the team’s belief that the result was not due to intentional use.

“In late September, Iasmin was flagged for metabolites of a prohibited substance. However, she was tested in August after her fight, with the result returning negative, and again in October, which also came back negative.

Iasmin has not knowingly used any prohibited substances and based on the amount and type of the detected metabolites, we firmly believe that this is a case of contamination rather than intentional use. We are working diligently, in collaboration with Drug Free Sports and the UFC, to identify the source of this contamination.

We are actively working to find answers. Since the test was conducted while Iasmin was booked to fight in Las Vegas, the Nevada State Athletic Commission (NSAC) has jurisdiction over this matter and we are working with them aswell to clear the situation.

As we stand, we have identified two supplements that align with the timeline of the tests. These samples have been sent to the SMRTL labs in Utah for comprehensive testing, with the hope of uncovering the cause and ensuring transparency for all involved.”

Lucindo (18-6) has been on a strong run since dropping her UFC debut, racking up four wins and emerging as a legitimate prospect-turned-contender at 115 pounds. She suffered a boring unanimous decision loss to Amanda Lemos at UFC 313 earlier this year, but bounced back with a solid decision win overAngela Hill.

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