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L-Phenylalanine Supplement by Source Naturals - Essential Amino Acid toner-for-skin-type Say goodbye to the hassleDescription 500 mgDietary SupplementFree FormAn Essential Amino AcidSuitable For Vegetarians L Phenylalanine, an essential amino acid, is a precursor of the amino acid tyrosine and a whole series of neurotransmitters and hormones. Phenylalanine is first converted to tyrosine, which becomes L dopa, which converts to norepinephrine, a key neurotransmitter and an adrenal hormone. L Phenylalanine is also a direct precursor of PEA (phenylethylamine),