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L-Phenylalanine, an essential amino acid, is a precursor of the amino acid
tyrosine and a whole series of neurotransmitters and hormones. L-Phenylalanine
is also a direct precursor of PEA (phenylethylamine), another important
neurotransmitter. Phenylalanine is an extremely important nutrient that must
be obtained through the diet or by supplementation.