Growth Hormone (GH) is considered the master hormone, because it is released by the master gland - the anterior pituitary gland. GH is not necessary or critical to one's survival, but it does play an important role in human development. During puberty, GH levels determine a persons height and bone size. After puberty, GH continues to regulate the body's metabolism. Growth Hormone supplements are not HGH (Human Growth Hormone), they are products designed to increase your body's natural production of GH from the pituitary gland.