HGH is a natural hormone of the body that was originally named because of its ability to stimulate growth in children. However, subsequent research has shown that GH is necessary for proper maintenance and function of practically all systems in the body. The human growth hormone is a polypeptide hormone consisting of 191 amino acids. In humans it is produced in the hypophysis and released if there are the right stimuli (e.g. training, sleep, stress, low blood sugar level). It is now important to understand that the freed HGH (human growth hormones) itself has no direct effect but only stimulates the liver to produce and release insulin-like growth factors and somatomedins. These growth factors are then the ones that cause various effects on the body.