HGH can benefit adults as we lose the capacity to produce it over the years. Getting real HGH is through a doctor and can have side effects if not monitored. It helps build muscle, reduce body fat and increase skin elasticity, etc. Stallone is big on the stuff. My assumption is it would probably help as it does with body builders but the stuff you are referring to is the store bought vitamin kind that is essentially vitamins that reportedly help your body produce it's own somewhat. That can't hurt.
Also, If your buying HGH off the internet it won't do anything. The only true HGH that will have any effect on your body are shots administered by a Doctor. True you can buy real HGH but most of the stuff on the internet is bunk. Also, HGH treatments are thousands of dollars, so if you see a "HGH Cream" for 50 bucks I can pretty much assure you it is junk.
Thanks everyone and, Pegasus your right, i think they misuderstood me i was just wondering, What was the L-Arginie for and how it effects the penis and why do the JP Routine recommend it