GABA increases plasma growth hormone levels 5 fold and mucuna pruriens helps also. take 500 mg of pure mucucan pruriens and 5 grams of GABA a day at bedtime. You will notice big difference just like the real thing. Alpha GPC also helps.
Labrada makes a product called Humanofort that is supposedly pretty good. I think HGH supplementation is way overrated anyway - even real HGH. Takes too long to see results and not enough bang for your buck.
I tried Humanofort and it did zero for me. Labrada sells it here but it's apparently all the rage in Europe as being a tonic. What I mean by that is you take it and it is supposed to normalize your levels of whatever is bothering you. Google it and you'll see more info about it.