Phenylalanine is an essential aromatic amino acid that is a precursor of melanin, dopamine, noradrenalin (norepinephrine), and thyroxine.
L-phenylalanine may be helpful in some with depression. It may also be useful in the treatment of vitiligo. There is some evidence that L-phenylalanine may exacerbate tardive dyskinesia in some schizophrenic patients and in some who have used neuroleptic drugs.
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