Enzymatic Phosphorylation of Oxidized Tyrosine Residues L Tyrosine vs. Dextroamphetamine In a sleep deprivation study, L Tyrosine actually outperformed one of Adderall's active stimulants (dextroamphetamine) in key cognitive tests, like mathematical processing and logical reasoning, even after 30 hours with Schematic illustration of tyrosine and catechol oxidation process by Download Scientific Diagram The role of tyrosine hydroxylase dopamine pathway in Parkinson's disease pathogenesis Research Communities by Springer Nature Tyrosine Decarboxylase Worthington Enzyme Manual Worthington Biochemical