L-Arginine is an amino acid commonly sold in supplement form and obtained naturally in our everyday foods. Plant and animal proteins contain L-Arginine, e.g. dairy. With the presence of guanidine, Arginine is alkaline. It is easy to form a salt with the acid reaction. L-Arginine is one of the 20 amino acids which build up protein. It is one of the non-essential amino acids, Our body can synthesis L-Arginine. It is an important component of collagen, enzymes and hormones, skin and many connective tissues. L-arginine plays a very important role in the synthesis of various protein molecules. It may have antioxidant ability and reduces accumulation of compounds such as ammonia and plasma lactate. L-arginine also inhibits platelet aggregation, and it decreases blood pressure. When consumed, L-Arginine is converted to nitric oxide which aids in the relaxation of blood vessels.