Growth Hormone, or HGH, is a hormone that is naturally released by the pituitary gland and circulates in the blood signaling the liver and other cells to release IGF-1 back into the bloodstream. IGF-1 is primarily responsible for influencing everything responsible for cellular growth and rejuvenation. Therefore, growth hormone is instrumental in building strong bones and healthy lean muscles. It is IGF-1 that stimulates all of the processes from cellular division to bone growth that allow children to grow into their teens, to achieve their full strength and stature into adulthood. While HGH is vitally important during those growing years, we still need HGH even as adults, so that we can continue to replace damaged cells, and to maintain good muscle mass and bone health throughout our lives.