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 Tyrosine Decarboxylase Worthington Enzyme Manual Worthington Biochemical 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 Biotechnology Challenges to In Vitro Maturation of Hepatic Stem Cells Gastroenterology Kinetic analyses of two steps oxidation from l tyrosine to l dopaquinone with tyrosinase by capillary electrophoresis dynamic frontal analysis ScienceDirect tyrosine hydroxylase Butterfly Sciences