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L-theanine, a natural constituent in tea, and its effect on mental state - PubMed

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial - PubMed

L-theanine—a unique amino acid of green tea and its relaxation effect in humans - ScienceDirect

The combined effects of L-theanine and caffeine on cognitive performance and mood - PubMed

The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review - PubMed

The effects of L-theanine, caffeine and their combination on cognition and mood - PubMed

l-Theanine reduces psychological and physiological stress responses - ScienceDirect

Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary α-amylase activity, trait anxiety and subjective stress - PubMed

A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave® L-Theanine on Stress in a Healthy Adult Population - PubMed

Effects of chronic l-theanine administration in patients with major depressive disorder: an open-label study - PubMed

L-Theanine reduces psychological and physiological stress responses - PubMed

The Cognitive-Enhancing Outcomes of Caffeine and L-theanine: A Systematic Review - PubMed