This will explain the impact of HGH on sports, bodybuilding and how it functions when injected into the body. HGH (Human Growth Hormone) is also known as somatropin and is a peptide hormone consisting of a 191 amino acids in a single chain. It is secreted by the anterior pituitary gland and is responsible for the growth of cells and regeneration of tissue in the body. The main need for HGH is during adolescence as it stimulates growth within the body during the years of puber