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 Tyrosinase drives hydroquinone induced exogenous ochronosis: not HGD inhibition EurekAlert! Colorimetric and visual detection of tyrosine based on its copper catalyzed enzymatic oxidation to dopamine and subsequent reductive formation of colored gold nanoparticles using copper ions Microchimica Acta Springer Nature Link Catalytic mechanism of the tyrosinase reaction toward the Tyr98 residue in the caddie protein PLOS Biology Tyrosinase Expressing Neuronal Cell Line as in Vitro Model of Parkinson's Disease tyrosine hydroxylase Butterfly Sciences