A very readable question-&-answer guide to a natural supplement that could be your key to a longer, healthier life. It details the complete scientific explanations on how this natural hormone works to keep the human body healthier for longer. You can find out exactly what melatonin is, why it is called the "master hormone," who should take it as a supplement, its use as a sleeping pill, safety aspects, and how it helps the body in many different ways. Not only is melatonin a powerful anti-oxidant, but it also boosts the immune system in a variety of ways. Contains a very useful glossary and extensive bibliographies by chapters. For readers interested in natural hormone supplementation, I also highly recommend the works of Dr Ray Sahelian on DHEA, Pregnenolone and Melatonin.