Table 2.
Nutritional classification of proteinogenic amino acids in Essential (EAA) and Branched Chain Amino Acids (BCAAs), conditionally essential and non-essential in humans, as previously reported [98].
| Essential AA | Conditionally Essential AA | Non-Essential AA |
|---|---|---|
| Histidine | Arginine ** | Alanine |
| Isoleucine * | Cysteine | Aspartic acid |
| Leucine * | Glutamine | Asparagine |
| Lysine | Glycine | Glutamic acid |
| Methionine | Proline | Serine |
| Phenylalanine | Tyrosine | Selenocysteine |
| Threonine | ||
| Tryptophan | ||
| Valine * |
* Indicates Branched Chain Amino Acid (BCAA). ** Indicates essential AA in childhood and some pathological conditions.