Bodybuilders & chiropractors have long been known for having the scoop on how to buy supplements that will do the job for the least amount of money.
I,personally, like to buy my supplements at a health food store with a good return policy in case it doesn't work out.
I looked up the ingredients listed on this product from another member's link, and here's a link to a website that appears to be frequented by bodybuilders that rates HGH products. The reviews are quite interesting.