L-theanine (γ-glutamylethylamide) is an amino acid found mainly in the green tea plant. This study examined the effects of an L-theanine-based nutritional drink on mood responses to a cognitive stressor. Additional measurements included an assessment of resting-state cognitive performance and alpha oscillatory activity using magnetoencephalography (MEG). Thirty-four healthy adults aged 18-40 years participated in this…
