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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) another important neurotransmitter.