Amino acids of proteins that can be made (biochemically synthesized within the body) by humans and certain other vertebrate animals from simple chemical precursors (in contrast to the essential amino acids). These amino acids are thus not required in the diet (of humans and those other vertebrates).
The amino acids needed for protein synthesis within the cell that can be formed by the body. Examples include alanine, arginine, histidine, tyrosine, and cystine.
Those amino acids that the body can synthesize in sufficient quantity to meet its need.
A nonessential amino is an amino acid that can be synthesized within the body to an extent that it is not needed in the diet. Eleven nonessential amino acids are required for synthesis of the body’s proteins. Other nonessential amino acids that participate in biochemical reactions within the body include taurine, citrulline, and ornithine. Many amino acids that are nonessential for healthy individuals can become essential for others. For example, individuals suffering from phenylketonuria, an inborn error of phenylalanine metabolism, can eat only enough phenylalanine to provide for adequate protein synthesis; thus tyrosine becomes essential within their diet. Separate entries are provided for each nonessential amino acid.
An amino acid that can be produced by the body and is not required in the diet.