Nitric oxide is a relative newcomer to the arsenal of medicine. While a small and simple molecule that last but seconds after release, nitric oxide is a very useful gas. Nitric oxide is an active component of the endocrine, immune, and cardiovascular systems and is an extremely versatile and significant factor in a wide variety of functions within and throughout the human body. While nitric oxide may not be a magic bullet for all persons and their health issues, its medical application has become an increasingly interesting field of study for researchers and doctors alike as they consider the effect a little or a lot of nitric oxide can have on the health and welfare of the human body. This is the story of the mighty molecule that could and does play a vital role in keeping your body healthy, in prolonging your life, lowering your blood pressure, alleviating the problem of erectile dysfunction, and helping your memory.