Nevada Athletic Commission Confirms Jon Jones’ June 16 Test Positive for Estrogen Blockers

It turns out Rashad Evans was correct. In a hearing on Monday, the Nevada Athletic Commission announced that former UFC light heavyweight champion Jon Jones’ failed June 16 out-of-competition anti-doping test — the test that nixed his scheduled rematch at UFC 200 versus Daniel Cormier — was for two estrogen-blocking substances. NAC attorney Caroline Bateman stated revealed that Jones tested positive for both the anti-estrogenic agent hydroxyclomiphene as well as letrozole metabolite, an aromatase inhibitor. In male athletes, estrogen blockers and aromatase inhibitors are often used to both mask the use of exogenous steroids, help restart natural testosterone production, as well as potential physical symptoms …

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