This thread is like watching a two legged dog attempt to walk.
The average 30yo produces 400 mcgs of GH a day, which is then halved by the age of forty. Therefore, there are three ways to increase the levels of human growth hormone. The safest and most inexpensive (albeit least predictable) means is through aminos and supplementation to increase natural secretion by the pituitary gland. Human growth hormone itself is a balanced chain of almost 200 amino acids, so this makes sense.
All of these analogs can induce a significant growth hormone releasing effect: niacin, L-dopa (levodopa from broad beans,) L-glutamine, L-tyrosine, L-arginine, L-orthinine, L-lysine and arginine pyoglutamate combo, Pyroglutamate Acid, GABA, GABOB, Alpha GPC, Bacopa -- many backed by a dearth of scientific studies. There's also GHB, but that can be dangerous, and likely isn't any more effective than GABOB. They should be taken in an absence of any food, two hours before, one hour after.
You also have the injectable growth hormone releasers, themselves comprising over 40 aminos... again upredictable results. And then, the most expensive and potentially harmful (yet most predictable) methods involve injecting human growth hormone itself.
Yes, human growth hormone has the potential to grow hair, but is more likely to increase the integrity and density of any existing hair. HGH can also reduce body fat, and increase bone density and muscle mass etc.