Most of the top pros are actually undoing any of the benefits of the GH they take (and also undoing some of the benefits of the hormones and AAS they take) by the way that they train.
I've had great success putting muscle on the steroid using bodybuilders who have come to me for training advice. I simply give them a modified version of the training guidelines I use myself (lifetime natural). I started out advising friends about diet and nutrition, but was soon horrified by how little benefit steroid users actually get from the drugs they utilise, and it's all down to training practices.
Similarly with growth hormone... it's used to ramp up the metabolism in order to allow bodybuilders to train more frequently and for longer periods. They need it, simply because they train too much.
Ronnie Coleman gains most of his mass while NOT training.
He overtrains for months coming up to the Olympia, using GH and various AAS... and competes at, say, 260 lbs ripped. Then soon after the Olympia he comes off the steroids, GH etc and stops training for three months or so, hovering around 240 lbs (10% bf) relatively clean. He then starts training and juicing again and balloons up to 320 lbs, then starts overtraining again... the cycle repeats itself, but after the next Olympia his relatively clean; no-juice, no-training bodyweight will be higher, say 245-250 lbs. It's the rest and time off from training that is allowing him to improve every year.
If these top pros maintained their drug regimen, dropping just the GH, and limited themselves to one weekly hour-long workout... most of them would be gaining 20-30 lbs of lean muscle a year. Hell, some of them could gain twenty pounds just by skipping training altogether for two months.
The Luke