Probably the same as any other pro hormone, totally shut your natural test production down. gyno (boobs) stuff like that, kill your mood and libido. I know a guy at the gym i go to..he abused Pro hormones for about 9 months straight after loads of ppl telling him he would mess himself up. That was when he was 18, hes almost 19 now and looks like he has aids

He has lost a ton of muscle.