Arginine is an Amino Acid which converts to a gas molecule called Nitric Oxide in the blood system, a process called ADNO - Arginine Derived Nitric Oxide. In 1998 this discovery concerning Nitric Oxide won the Nobel Prize in medicine. Books like 'The Arginine Solution' claim extensive health benefits from taking 6 grams of Arginine on a daily basis, including its role with circulation and heart disease. It has been reported to help with; heart disease, high blood pressure, injury, long term memory, energy, erectile dysfunction, many other circulatory and cardiovascular problems and much much more.... Ark 1 contains 6 grams of Arginine