Why does hgh do

Overview

Human Growth Hormone (HGH), also known as somatotropin, is a peptide hormone consisting of 191 amino acids that plays a crucial role in human development and metabolism. First isolated and characterized in the 1950s, HGH is synthesized and secreted by somatotroph cells in the anterior pituitary gland. The hormone's discovery revolutionized the treatment of growth disorders, with the first therapeutic use occurring in 1958 for pituitary dwarfism. HGH secretion follows a circadian rhythm, with the highest pulses occurring during deep sleep, particularly during the first few hours of sleep. Production peaks during puberty, with adolescents secreting approximately 700 micrograms per day, then gradually declines throughout adulthood. By age 60, most people produce only about 25% of the HGH they produced in their 20s. The hormone's structure was fully sequenced in 1971, leading to the development of recombinant DNA technology that enabled mass production of synthetic HGH in 1981, eliminating the need for extraction from human cadavers.

How It Works

HGH functions through both direct and indirect mechanisms to regulate growth and metabolism throughout the body. When released from the pituitary gland, HGH travels through the bloodstream and binds to specific receptors on target cells, particularly in the liver. This binding stimulates the liver to produce insulin-like growth factor 1 (IGF-1), which mediates many of HGH's growth-promoting effects. The hormone works by increasing protein synthesis, enhancing the utilization of fat for energy, and reducing glucose uptake by tissues. HGH secretion is regulated by a complex feedback system involving the hypothalamus, which produces growth hormone-releasing hormone (GHRH) to stimulate release and somatostatin to inhibit it. The hormone's effects include stimulating cartilage and bone growth by increasing the production of collagen and the proliferation of chondrocytes, promoting muscle growth through increased amino acid uptake and protein synthesis, and enhancing lipolysis to mobilize fat stores for energy. HGH also has anti-insulin effects, reducing glucose uptake in peripheral tissues while increasing gluconeogenesis in the liver.

Why It Matters

HGH is medically significant for treating various conditions, with FDA-approved uses including pediatric growth hormone deficiency, Turner syndrome, Prader-Willi syndrome, and adult growth hormone deficiency. In children with deficiency, HGH therapy can increase final adult height by 4-6 inches when treated appropriately. Beyond medical applications, HGH has gained attention in sports and anti-aging circles, though its non-medical use is controversial and banned by most sports organizations. Research shows HGH can increase lean body mass by 2-5 kg and decrease fat mass by similar amounts in deficient adults, but it carries risks including joint pain, edema, and increased diabetes risk. The global HGH market was valued at approximately $4.5 billion in 2022, reflecting its importance in endocrine medicine. Understanding HGH's mechanisms helps researchers develop treatments for metabolic disorders and age-related conditions while highlighting the risks of inappropriate use.