L-Arginine

Arginine (arginase) is a kind of a amino acid, that is a kind of common and one of the natural amino acids. Arginine can be regarded as a kind of double sex amino acids, it is because the main chain and the most close to the side chain is part of a long, organic and hydrophobic, and arginine on the other side of the side chain is a guanidine.
L-Arginine