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L-tyrosine plays an important role in the central nervous system, the thyroid, and the adrenal glands.* It is an amino acid precursor for the synthesis of the neurotransmitters norepinephrine and dopamine.* L-tyrosine also serves as a precursor for the thyroid hormone thyroxine and for melanin.* L-tyrosine also supports adrenal and pituitary function and is a powerful antioxidant, helping neutralize free radicals.*