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A non-essential amino acid, L-Tyrosine is needed for the structure of almost all proteins in the body. The body synthesizes L-Tyrosine from the amino acid phenylalanine. L-Tyrosine is a precursor of several neurotransmitters, including L-Dopa, dopamine, norepinephrine and epinephrine. Nourish your brain and protect it from the effects of stress with Swanson Premium L-Tyrosine or Swanson Ultra L-Tyrosine, which features AjiPure® Pharmaceutical Grade L-Tyrosine.