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Classification of amino acids based on human nutritional requirements.
| Class of amino acid | Amino acids | Abbreviations |
|---|---|---|
| Essential | ||
| Histidine | His | |
| Isoleucine | Ile | |
| Leucine | Leu | |
| Lysine | Lys | |
| Methionine | Met | |
| Phenylalanine | Phe | |
| Threonine | Thr | |
| Tryptophan | Trp | |
| Valine | Val | |
| Conditionally essential | ||
| Arginine | Arg | |
| Cysteine | Cys | |
| Glycine | Gly | |
| Glutamine | Gln | |
| Proline | Pro | |
| Tyrosine | Tyr | |
| Non-essential | ||
| Alanine | Ala | |
| Asparagine | Asn | |
| Aspartate/aspartic acid | Asp | |
| Glutamate/glutamic acid | Glu | |
| Serine | Ser | |
