I'm guessing everyone's body reacts way different when you no longer have that testosterone boost, Chael even said he might have to retire.
Is it even safe for him to train not to mention fight one of the best in the world at heavy and light heavy. 
I mean for him to take a fight at 175
He just got off
UFC 175 that is
He went off it for the Rashad fight I believe. Even though he lostvhe still went the distance 
He'll be fine. Its not like insulin to a diabetic. He won't go into trt shock and have a seizure in the cage.
Not against dc. Lol