Human growth hormone, or hGH, is produced by the pituitary gland. Human growth hormone does more than regulate growth. It regulates other glands in the body, especially those that produce estrogen and testosterone. Human growth hormone is used to treat conditions that prevent children from growing. Another controversial use of hGH is as a performance-enhancing drug in sports. Recent research has also shown that hGH can extend the life and vitality of the elderly.