I wouldn't want to touch that crap (synthol) people that use it look ridiculous, like blowing up ballons in their arms. Look at the thread about the "man with the expolding arms", it is not building muscle! Some people claim that spot injections work, I don't see the evidence for this. In smaller muscles you will get some irritation, just like in the bigger muscles, which may be perceived as "growth" but getting punched in the arm has the same effect. HGH has the ability to create new cells, unlike steroids that just allows the muscle cells to grow, but this is needed to be taken over a lengthy period of time and in sufficiant amounts to actually see an effect. Secondly this need to be taken with steroid to optimize the effects. I have read a ton of articles on this and they all point to disappointing results if not taken properly. Now the final clincher, it is massively expensive! To do a decent cycle of this, and depending on your source, you are looking at $1000 - $2000 per month and I have read you need to run this for a minimum of 6 months, otherwise results will be disappointing! Here is an article talking about it:
http://www.steroid.com/HUMAN GROWTH HORMONE.phtml