HGH is the growth hormone of the human body that powers its growth during childhood right up past adolescence. It is a large and complex hormone that has a lot of influence on other hormones.

The fact that our bodies do not degenerate while we are young is largely due to the fact that HGH is being produced in adequate amounts by the pituitary gland, and consequently, growth exceeds decay, or degeneration.

After a certain age, however, HGH production slows down and almost grinds to a halt. The age when this occurs is roughly around the age of 40. That’s when we notice wrinkles setting in, and our bodies not as vigorous and lively as it once was. More info in this post on HGH, the Human Growth Hormone.