There is a whole grey area now with HRT therapy , which is effectively IM shots of injectable testosterone (but usually written at a lower dose than a gym rat would inject ) . That “LOW T” /“Hormone replacement therapy market is Huge and is a grey area where players of all sports from MMA to MLB try to receive exemptions , so they can effectively become a bit stronger , earn more money (thru improved performance and or duration ) and be under a dr’s supervision . These exemptions are also sought after regarding adderral and other nutropic (cognitive enhancing compounds ). pharmacology plays a significant role in all sports