Human growth hormone is a product of the pituitary gland, the master gland of the body. As the name implies, it promotes linear growth in children and adolescents. Specifically, HGH plays a major role in muscle and bone growth and cellular repair. It also promotes protein deposition and aids in the breakdown of subcutaneous fat. Our body starts losing hGH (human Growth Hormon) about 24% per decade after the age of 30 and by the age of 60, many will probably have lost 75% of the HGH that their body produced and still needs.