Just prior to his rematch with now-former middleweight champion Anderson Silva, Chael Sonnen dramatically declared that he needed to undergo testosterone-replacement therapy, or he would die . A year later he told California regulators that, if he discontinued the treatment, he would have the hormone levels of a 93-year-old. A doctor who recently reviewed Sonnen’s medical history would agree the fighter now needs to use prescribed testosterone to compete as a professional athlete. But she is uncertain whether he needed it in the first place. In a letter written to Sonnen’s management, which was forwarded to the Nevada State Athletic Commission with the fighter’s second request to undergo TRT for UFC 167 this past month, University of Arizona endocrinologist Karen Louise Herbst concluded the fighter meets the criteria for hormone-replacement therapy (TRT). She said he is “likely permanently hypogonadal” because he has used testosterone since 2008.
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Endocrinologist: Chael Sonnen’s initial diagnosis of hypogonadism not definitive – MMA Junkie