Advance Arginine is an amino acid that plays an important role in several important pathways, including the synthesis of proteins, the production of creatine phosphate, needed to produce ATP, and the synthesis of nitric oxide, a secondary messenger involved in blood flow. Advance Arginine is an essential precursor of nitric oxide which helps supports vasodilatation to enhance blood flow to the tissues. The results lasting energy, stamina and performance. The amino acid L-Arginine has several major functions in the body, including as a precursor of nitric oxide (NO). This chemical messenger plays a vital role in vasodilatation, relaxation of smooth muscle cells within arterial blood vessels. Dietary L-Arginine provides the nitrogen to our bodies for an improved muscle metabolism and promoting immune function.