I tried HGH when I was 27. I used 5ius/day for about 5.5 months. The first month was unbearable because of the sides! I have Carpel Tunnel and the HGH made it about 10x worse. Other issues like night sweats and a over-all puffiness to my muscles(water ret) caused me grief too.
On the positive side, I burned off alot of fat, and once the bloat went away, my muscles had a more grainy look. I would say, my experience would have been more positive had I waited until I entered my middle age years to give it a go.