L-tyrosine is an amino acid that's often used in supplements to improve cognitive function affected by stress. Supplements containing L-tyrosine supplements may also help treat phenylketonuria (PKU).

In case of inconsistencies, a third reviewer (A.L.V.C.) was involved in the process. The Kappa test generated an intra-examiner (100% agreement; kappa 1.00, 95% CI; 95.74% agreement; kappa 0.91, 95% ...