Your red blood cells work like magnets in relation to the oxygen you take in; part of your RBC's contain hemoglobin, an iron molecule that binds to that oxygen. The more RBC's your body produces then, the more oxygen your body can hold. This is why it's so popular and critical in endurance sports like cycling. I ignored this one like an idiot because I presumed its lack of significance to muscle mass would make it useless, but that's obviously ridiculous (as some readers were quick to point out). Plenty of fighters rely on attrition to win fights, and in the championship bouts, this is even more critical.
Athletes, like all others, may have illnesses or conditions that require them to take particular medications. If the medication an athlete is required to take to treat an illness or condition happens to fall under the prohibited list, a therapeutic use exemption may give that athlete the authorization to take the needed medicine. Criteria for granting a therapeutic use exemption are 1.) The athlete would experience significant health problems without taking the prohibited substance or method, 2.) The therapeutic use of the substance would not produce significant enhancement of performance, and 3.) There is no reasonable therapeutic alternative to the use of the otherwise prohibited substance or method. Note hormone replacement therapy (HRT), . supplementing with prescribed testosterone in any form to raise testosterone levels due to natural decreases that occur with aging (even if to just elevate levels to within ‘normal’ ranges), is NOT considered a medicinal exception. Persons using HRT would not be eligible for WPA/NANBF/IPE competition.
Diaz (26-9-2) hasn’t competed since a 2015 “No Contest” to Anderson Silva at UFC 183. The result was originally ruled a unanimous decision for the former middleweight champion however Silva failed a pre-fight drug test for banned substances drostanolone, androstane, oxazepem, and temazepam. In addition Diaz was suspended for five years and fined $165,000 for his failed drug test of marijuana metabolites during that fight as well. His suspension was eventually lifted on Aug. 1, 2016. However he has yet to step back in the octagon.