Human Growth Hormone supplements, or HGH supplements, are the ally of anyone looking to add muscle, whether for body building or sports performance. HGH supplements serve two primary functions - to build muscle, and to burn fat. The problem for most people is that HGH output peaks in our late teens and early twenties, and tails off dramatically thereafter.

By the time you are in your 40s, the body is producing as little as one tenth what it was at its peak. The good news is that both heavy weight training and hard interval training can spur the body into increasing output, and thus allow older athletes to build muscle.