As previously reported, Brock Lesnar has now been flagged twice by the USADA due to the same substance.
According to Lance Pugmire of the Los Angeles Times, a source close to the Brock Lesnar situation says that Lesnar tested positive for the substance Clomiphene, which was the same substance that Jon Jones tested positive for. Clomiphene is an Estrogen blocker that is commonly used by bodybuilders to increase testosterone production while cycling off steroids.
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