Human Growth Hormone (HGH) is believed by many to be one of the most beneficial antiaging substances due to its ability to reverse many age-related changes. Never-the-less, it remains a controversial subject. Dr. Walker, (founder of the Scientific Aging Research Academy- SARA) is one of the serious academic scientists who for many years has supported antiaging research and he is an expert in HGH replacement therapy. His latest research is studying the role of GHRP (growth hormone releasing peptides) and their benefits for aging individuals