Arginine. Arginine (2-aminoguanidinovaleric acid) is an alpha amino acid that has garnered significant research interest for its involvement in a several. Arginine, an essential amino acid, has a positively charged guanidino group. Arginine is well designed to bind the phosphate anion, and is often found in the. Jun 30, L-arginine is an amino acid that helps the body to build proteins. Athletes and others seek out ways to boost their L-arginine intake. It may have.