I worked with rhGH for over two years in the biotech field. It is a medium sized protein, about 26,000 Da in mass, and has a complex folding pattern. The hGH works in the IGF-1 pathway to increase the body's release of IGF-1 which promotes growth in children. In adults, it increases the lean muscle mass and muscle tone, however, it also causes gigantism- you will have growth in the forehead, hands and feet only, and totally out of proportion with the rest of your body at high doses. It is extremely expensive because of the cost of manufacture, storage, and the injecting into you by an M.D. We could get it as cheap as ~$2000 US per gram, and it is sold to the consumer at close to $20,000 US/gram or more. Previously cadaveric hGH was used, but is causes a "mad cow" like disease later on in life, which rHGH does not cause. The hebal supplements are based on an experiment a researcher did where he found that certain amino acids caused a very short term burst of IGF-1. This burst is so low it has no clinical significance.
There is data showing hGH can help Crohn's disease sufferers and may have benifits in older folks as the hGH in the body decreases with age. At the right dose, gigantism can be avoided while growing better muscle tone which could improve the quality of life in people over 65.
rhGH can be made in e-coli bacteria or yeast. rbGH, bovine growth hormone has no effect in the human body whatsoever, and the current data supports this. Anyway, I could go on and on.
Some of the most important facts are:
Dietary supplements do not contain hGH, if they did, it isn't there now because it breaks down rapidly unless stored properly (in zinc acetate buffer, freeze dried at -20C or below.)
In the research, the amount of hGH released by eating DS is so tiny, it has no effect on the body.
Only use rhGH because cadaveric causes a fatal neurological disease.
Manufacterers of rhGH include: Genentech in San Francisco Calif., Novartis AG, and others.