Quinton "Rampage" Jackson said after his UFC 144 loss that he dealt with injuries before the card, but didn't want to disappoint his Japanese fans. He's now admitted to using testosterone replacement therapy,

Rampage-

It was hard for me to train, it takes time to heal, I couldn't do certain things, but this was my first time ever using testosterone. I took what the doctor prescribed to me and I went to the pharmacy… I gave myself small doses and that shit immediately changed me, that's why I am saying now I am not going to retire. I am not gonna retire no time soon, its just unfortunate that I got this injury.

My sex life changed, I was back to five times a night like when I was 25, straight up. I got stronger, lifting weights. I was never good at lifting weights but I was doing everything, pull ups and stuff, everything with my top half. I gained a lot of weight but I gained a lot of water as well, I never knew about testosterone putting weight on you like that. I had to cut weight [for the fight] and I cut 22 pounds out of the 30 I needed to cut, I just couldn’t make the rest. I couldn’t make the rest.

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