Both substances help your body recover much faster. Both substances help your body rejuvenate and make you perform better. The only difference I see is steroids are old science and most fighters are accustomed to it, while stem cells therapy is relatively new science whose potential will be fully exploited in the decades to come. Reminder, steroid are not banned for regular use, just for sports. Proper use of steroids help millions of people have better lives. Do you think they will ban stem cells therapy, since it is basically giving you a great physical advantage? Not just mma, but all sports in general. Your heart is damaged due to 20 years of hard work in the gym? No problem, lets repair it with stem cells. It will not skip a beat. Your testosterone is low? Lets fix your balls with stems and make you a 20yo again. Your knees are shot? Lets do'em. The line between banned science and allowed science is getting thinner and thinner. What are your thoughts?