The doses I'm about to give you are the best range for maximizing GH in a pre-workout stack. If you have anti-aging properties in mind, smaller doses will work as well.
Arginine (5-8 g) or arginine Pyroglutamate. I hinted at this in my last article, are prime movers in the production of natural GH.
Ornithine (4-7 g) works synergistically with arginine, from which it is derived. Together they have the best impact.
Glutamine (5 g) or Glutamine Peptides preserve the use of arginine in depleted circumstances.
Glycine (3-10 g)
OKG (3 g) is very expensive, but useful
BCAA's (3-6 g) for musclebuilding properties, enhanced by GH.
GABA and Lysine in trace amounts, but since they may inhibit the other amino's, it would be best to take these at different times.
Other dietary sources of GH promoting nutrients are
Vitamin C (ascorbic acid), Vitamin B3 and most
anti-oxidants. Take your stack, which ever amino's it ends up consisting of, 45 minutes prior to your workout for maximal levels of Growth Hormone. On non-workout days, take your stack either before bed or in the morning, both on an empty stomach.
Got this from
http://www.bodybuilding.com/fun/cathgh.htm
What are you guys stacking with?