What is human growth hormone HGH?

Human growth hormone is Human Growth Hormone, a substance secreted by the pituitary gland (Pituitary Gland) that stimulates growth. The growth of human body is controlled by growth hormones. Until the age of twenty-five, the peak of growth is 600mg in blood. It is decreasing year by year, and only about 15% at age 60-70. Some people, if they are partial to their food intake, are not balanced in their nutrition intake. It may be 15% at 40-50. Therefore, they are older and more gaunt in appearance than those of the same age.