Secretagogues are substances which increase the release of hormones in the body, in this case, the release of growth hormone by the pituitary.
Precursors are substances that the body uses to make growth hormones.
Many pharmaceutical companies are racing to develop products that provide the body with safe and continuous levels of HGH-releasing secretagogues. You don't need to wait for this to happen, though, because nutritional secretagogues, consisting of amino acids and herbs and other natural substances, have been clinically proven to increase the release of growth hormone with great success. Anti-aging clinics prefer secretagogues over HGH injections, because they are safe and affordable, and the best formulations can be more effective than injections. If you can stimulate the body to make its own GH, you're in great shape. The heart of the Growth Hormone Enhancement Program is the use of GH releasers or agonists, substances that induce the release of growth hormone from the pituitary.