Somatotropin, also known as growth hormone, is a protein hormone produced by the pituitary gland in the brain. It plays a crucial role in growth, cell repair, and metabolism. In children, somatotropin helps promote growth in bones and muscles, while in adults, it helps maintain healthy body composition and supports various bodily functions. In medicine, synthetic somatotropin is used to treat growth disorders in children and hormone deficiencies in adults. It can also be used in livestock to increase growth rates and improve feed efficiency. However, its use in sports for performance enhancement is controversial and often banned.