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Brain and Nervous System Health350 mg Per CapsuleDietary SupplementSupports Mood RegulationHelps Maintain ConcentrationSupports Increased Bioavailability of TyrosineScience-Backed Quality Since 1969Swanson N-Acetyl L-Tyrosine supplement is a fast-acting form of this important amino that is better absorbed and more completely utilized than other supplemental L-tyrosine. The amino acid L-tyrosine is a key component in the production of and transmission by neurotransmitters essential to mental wellbeing.