... L-Arginine Manufacture Standards: FCCIV,AJI92,USP26,EP5 L-ArginineIndications and UsageArginine (abbreviated as Arg or R) is an α-amino acid. The L ... bases or codons that codify for arginine during protein synthesis. In mammals, arginine is classified as a semiessential or ... . Preterm infants are unable synthesize or create arginine internally, making the amino acid nutritionally essential for ...