On the flip side of the ability of HGH to bring about fat loss, is its ability to bring about gains in muscle mass.
Again, there has been study after study that has confirmed this result.

The way HGH helps the body build muscle is in its ability to promote reactions that generate new protein, new cells. It does this while operating in the guise of its successor, IGF-1. As IGF-1, it stimulates the uptake of amino acids, which are the building blocks of protein. This, in turn, increases the synthesis of DNA, RNA, proteins, and extracellular proteins, all of which engenders an increase in both cell size and the rate of cell division.

HGH also promotes the conserving of nitrogen in the body. Since nitrogen is an essential element in amino acids, and therefore in muscle, this helps keep its stock from being diminished or depleted.

In the 2000 Olympics, testing of IGF-1 levels was a hot issue due to the unfair advantage athletes have with the higher levels. Most athletes now use amino acid stacks to improve their performance - safely.