hgh should be taken with t4 and test for bodybuilding purposes.From all the research I've done, HGH does not shut down your natural HGH production, although your sensitivity to it may diminish over time if used often. ANd it's best to take it at times that avoid your natural peaks (right after bedtime, right after training) as your Liver can only process so much at once, so injecting it at a natural peak time is wasting it to some degree. There are people, bodybuilders and others, who have taken it for years nonstop. It will likely reduce your thyroid output somehwhat, and so cynomel is usu. taken with it. It should be injected with an insulin syringe usually into the abdominal, but not directly in, you must pull off a bit of fat and inject into the fat. due to the insulin syringe and not injecting intramuscularly (directly into the muscle) it is virtually painless. excessive use of hgh can cause you to get what is known as "growth hormone gut" which is when despite being ripped you will still have a belly due to your organs growing excessively out of proportion. but that takes alot of hgh, just make sure you do as much research as you can before you let anything enter your body. better safe than sorry bro. Good luck!