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NOW Foods L-Tyrosine Pure Powder 4 oz for Mental Alertness & Mood Support facial foam these stem cells help toDescription Neurotransmitter SupportPharmaceutical GradeHealthy Glandular FunctionSupports Mental AlertnessNon GMOA Dietary SupplementKosherAmino AcidsFamily Owned Since 1968 HalalGMP Quality AssuredTyrosine is a conditionally indispensable amino acid required for the production of the neurotransmitters dopamine, adrenaline, and noradrenaline, as well as for the skin pigment, melanin. Noradrenaline (norepinephrine) and adrenaline (epinephrine) are the