The Nobel-Prize-winning discoveries of Dr. Ferid Murad brought nitric oxide into widespread recognition as the "star molecule" of the twentieth century, particularly in the area of human health. The actions of nitric oxide in the body touch almost every important aspect of physical well-being. For the first time, Dr. Murad and Dr. Daniel Chen present a clear description of the physiological functions of nitric oxide in language that everyone can understand. They then show us how to identify early signs of a broad range of nitric-oxide-related illness spanning the gamut from cardiovascular disease through neurological problems to sexual and reproductive issues. They reveal specific steps that we can take to improve and sustain vitality by promoting the action of nitric oxide within our bodies, and they show us how to maximize the amazing effects of nitric oxide so that we can live longer, happier and healthier lives.