Human Growth Hormone (HGH) is one of the most popular new subjects of medical study. This hormone is produced in the pituitary gland, which is located at the base of the brain and is responsible for the growth and health of cells in practically every part of the body. As we get older, our bodies produce less and less HGH. This drop in HGH levels leads to many of the most common signs of aging: Wrinkles, thinning hair, loss of muscle tone, and a decrease in mental and sexual function. Recent studies suggest that HGH replacement therapy can slow and even reverse some of these signs of aging, effectively turning back the clock

One method of HGH replacement therapy involves injections of pure HGH. This form of therapy requires a doctor's prescription and can be quite costly, with the expense topping $20,000 a year in many cases. The prohibitive cost of HGH injections has led to a booming market in alternative HGH therapies, including pills, sprays, and powders that claim to increase the body's natural production of HGH. Medical studies, however, have yielded mixed results on the effectiveness of such therapies. The surest way to achieve the desired effects of HGH replacement therapy is through HGH injections.