For a few years it seemed like it was everywhere, a legalized doping scourge whose synthetic tendrils plunged deeper into the sport with every passing month. Then one day it stopped, just like that. On Feb. 27, 2014, the Nevada State Athletic Commission voted to ban the practice known as TRT, or testosterone-replacement therapy, and urged other commissions to follow suit. That same day, UFC officials, who had once been publicly supportive of TRT, expressed their enthusiastic support for the ban in an official statement, writing that the company also intended to “honor this ruling in international markets where, due to a lack of governing bodies, the UFC oversees regulatory efforts for our live events.” That sound? That was the death knell of TRT in MMA
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Today in MMA History: TRT gets banned after years of controversy – MMA Junkie