Desma Ototropin - HGH is a hormone that is normally produced by the body. It really is synthesised and secreted by skin cells in the anterior pituitary gland located at the base of the mind. HGH stimulates many metabolic processes in cells. HGH affects protein, fat, carbohydrate and mineral metabolism. The major role of HGH is to stimulate the liver to secrete Insulin-like Growth Factor-I (IGF-I). IGF-I stimulates production of cartilage cells, resulting in bone growth and also plays a key role in muscle protein synthesis and organ growth.