Tyrosine is a non-essential amino acid synthesized in the body from the essential amino acid phenylalanine. The typical dietary amount provided by a 3 oz portion of animal protein ranges from 0.3 g to 1 g of tyrosine. Tyrosine is the precursor amino acid from which the body makes dopamine (with vitamin B6 as a cofactor), which is then converted to norepinephrine (with vitamin C as a cofactor) and then to epinephrine (with SAMe as a cofactor).
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