Arginine is an amino acid that is a precursor of nitric oxide in the body. Nitric oxide causes vasodilatation and relaxes muscle tissue. Arginine Malate is a non-polar form of Arginine that is rapidly absorbed in the body. It is also much more stable than regular L-Arginine. Because of the increased absorption and stability Arginine Malate can raise nitric oxide levels to a greater degree than regular L-arginine supplements.