Arginine (abbreviated as Arg or R) encoded by the codons CGU, CGC, CGA, CGG, AGA, and AGG is an α-amino acid that is used in the biosynthesis of proteins. Arginine is classified as a semiessential or conditionally essential amino acid, depending on the developmental stage and health status of the individual.
Aspartic acid is believed to help your body promote a robust metabolism. From time to time it is used to treat depression and fatigue. This amino acid plays a key role in the citric acid cycle (also known as Krebs cycle), within which a number of other amino acids and biochemicals are formed.
Glutamic acid, abbreviated as E or Glu, is an important amino acid for the synthesis of proteins. The salts and carboxylate anions associated with glutamic acid are referred to as glutamates. Glutamic acid contributes to the health of the immune and digestive systems, as well as energy production.
Like valine and isoleucine, leucine is a branched-chain amino acid. The primary metabolic end products of leucine metabolism are acetyl-CoA and acetoacetate; consequently, it is one of the two exclusively ketogenic amino acids, with lysine being the other.