L-Arginine methyl ester is a protected form of L-Arginine (A769505). L-Arginine is an conditionally essential amino acid for humans and adult mammals as it's requirements exceed production during certain developmental stages in life (such as pregnancy). L-Arginine also prevents blood toxicity from intravenous amino acid administration in humans. Molecular Formula: C7H18Cl2N4O2 Molecular Weight: 261.14999999999998