Banned Substances Brock Lesnar And Jon Jones Tested Positive For Revealed

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For the last few weeks, UFC fans around the world have been speculating about which banned substances Jon Jones and Brock Lesnar could have tested positive for.

Both Jones and Lesnar failed drug tests, with Jones’ positive test prior to UFC 200 resulting in him being pulled from the show and from his scheduled main event light heavyweight title fight against champ Daniel Cormier.


WWE superstar Lesnar, meanwhile, did compete at the July 5 event, returning to the Octagon after almost five years out of the sport to defeat Mark Hunt. However, it later emerged that he had failed two drug tests – one in-competition and one out-of-competition – which put a massive question mark over the legitimacy of his victory.

It has now been revealed that the banned substance Lesnar tested positive for in both tests was hydroxy-clomiphene – an oestrogen blocker – a source confirmed to MMA Fighting.

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And, as it happens, Jon Jones also tested positive for an oestrogen blocker – clomiphene, in this case – as well as Letrozole, an aromatase inhibitor.

A couple of weeks ago, former UFC fighter Chael Sonnen did actually claim that Jones had tested positive for oestrogen blockers on the Joe Rogan Experience podcast – and it looks like his insider info was correct.

That allegation, at the time, led Rogan himself to note that ‘oestrogen blockers are usually when people are getting off of steroids’ – and, indeed, it is commonly used as post-cycle therapy (PCT) for those coming of anabolic steroids.


However, of course, this is only speculation in reference to Lesnar and Jones’ cases.

Both Lesnar and Jones are now facing sanctions from U.S. Anti-Doping Agency (USADA), the body that collected the samples, and the Nevada Athletic Commission (NAC).

After an adjudication process, the NAC has the power to suspend and fine both Jones and Lesnar, while USADA also has the power to suspend both fighters, as the UFC’s official anti-doping partner.


Lesnar’s win over Hunt would also be overturned to a No Contest, should the NAC sanction him for the drug test failures.

Both Jones and Lesnar have denied knowingly taking any banned substances.


MMA Fighting