Growth hormone (GH) is a peptide hormone that stimulates growth, cell reproduction and regeneration in humans and other animals. Growth hormone is a 191-amino acid single polypeptide chain that is synthesized, stored, and secreted by cells within the vendor side wings Spain somatotroph HGH. Anterior pituitary gland. The dose of HGH. Somatotropin (STH) refers to growth hormone naturally produced by an animal, whereas the term somatropin refers to growth hormone produced by recombinant DNA technology, and is abbreviated "HGH" in humans.