L-Arginine is one of the amino acids that stimulates the pituitary gland to secrete growth hormone (regardless of your age) and also helps to repair bones and tissue. It also helps improve physical performance.

Why are these things important to you? First of all, human growth hormone helps reduce the percentage of fat the body stores and makes it easier to gain muscle mass. This enables the bodybuilder to sculpt a smoother body in less time.
Since Arginine helps with the repair of tissue – and since muscles are built by repeatedly “tearing them down” and rebuilding them – anything that helps them to heal faster is beneficial.

Finally, Arginine helps to improve your workout performance by improving your exercise capacity – it facilitates the transfer and release of nitrogen in the blood stream.
If the above reasons aren’t enough to convince you that L-Arginine is an essential part of your routine, then consider the benefits it provides even to non-lifters. It enhances the immune system by stimulating the production of T-cells, helps to detoxify many harmful agents (including second-hand smoke), offers some protection against alcohol for the liver, and assists the pancreas in the release of insulin.