Brain Support Supports Production of Neurotransmitters Non-GMO Gluten Free Dietary Supplement Amino Acid Jarrow Formulas® L-Tyrosine is pure crystalline L-Tyrosine. L-Tyrosine, a constituent of dietary protein, is a precursor to the catecholamine neurotransmitters norepinephrine, epinephrine and dopamine, the levels of which can be affected by the amount of tyrosine consumed.
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