human growth hormone - Version 1.0 Arguably the most important hormone in your body, Human Growth Hormone, or HGH, is produced by the pituitary gland in your brain. After the age of 20, the hormone release rate greatly decreases, and by the age of 30 most people start to notice an acceleration in the aging process. One of the leading factors involved in this decline is the decreased production of Human Growth Hormone. Studies indicate that your body produces about 15% less of the hormone with each successive decade. As you get older and your body begins to produce less of the human growth hormone, you start to notice that you look and feel older. Human Growth Hormone stimulates virtually all of the various systems in your body. The hormone