Pharmaceutical hgh is a synthetic form of a natural hormone produced by the pituitary gland. In the body, growth hormone is responsible for bone and muscle growth, organ development, and metabolism. It is used in medicine to treat children and adults with growth hormone deficiency or certain genetic conditions. Some people use HGH to speed up muscle growth or improve physical fitness, but doing so can be dangerous without a doctor’s supervision. It is important to follow your doctor’s instructions and have regular medical checkups to ensure the safe use of growth hormone. A healthy lifestyle, proper nutrition, and exercise remain the safest and most effective ways to maintain muscle and physical fitness.