To understand what Human Growth Hormone (HGH) does in the body we need to look at the hormonal system (also called the endocrine system) and how it works. Hormones created by the glands in this system control nearly all of the processes in your body. These hormones are very specialized chemicals that help
regulate mood, growth/development, metabolism, reproduction, the way our organs work, and even sleep.
Some of these hormones may be familiar to you. They include estrogen, progesterone, testosterone, melatonin, serotonin, and adrenaline. The king of them all is Human Growth Hormone, or HGH.