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...of the body to metabolize the amino acid phenylalanine. Phenylalanine is normally converted in the human body to tyrosine, another amino acid, by a specific organic catalyst, or enzyme, called phenylalanine hydroxylase. This enzyme is not active in individuals who have phenylketonuria.
Phenylalanine is a precursor of brain phenylethylamine (PEA), a likely neuromodulator and promoter of overall energy and positive mood (43) Phenylalanine converts to tyrosine, which is in turn converted to dopamine, and subsequently norepinephrine and epinephrine, and is known to mildly stimulate the nervous system.