According to LA Times writer Lance Pugmire, Brock Lesnar tested positive for the estrogen blocker Clomiphene.
Clomiphene is the same substance Jon Jones previously tested positive for and is common among bodybuilders looking to increase testosterone while cycling off of steroids.
As we noted earlier tonight, in addition to failing an out of competition drug test taken by USADA from a June 28th sample prior to his UFC 200 fight, Brock Lesnar also failed an in-competition drug test prior to defeating Mark Hunt at UFC 200.
I’m told by an official with knowledge of Brock Lesnar’s positive test that the substance is clomiphene, the same one found in @JonnyBones.
— Lance Pugmire (@latimespugmire) July 19, 2016