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L-tyrosine is a nonessential amino acid (it can be made from phenylalanine) found in many protein sources. It is a precursor to epinephrine, norepinephrine, dopamine, and thyroxine. Supplemental L-tyrosine has been studied as an athletic enhancement aid and in the treatment of depression, drug dependence, narcolepsy, Parkinson's, Alzheimer's, phenylketonuria, and many other conditions.
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