Theanine raises levels of neurotransmitters such as serotonin, dopamine, and GABA. Helps specific memory and learning tasks, lowers anxiety and stress, and if taken with caffeine, gives faster reaction times and faster mental processing.


What is L-Theanine?

A constituent of green tea.

What is L-Theanine used for?

Take a look at a selection of studies carried out on L-Theanine:

Reducing Stress

  1. "L-theanine reduces psychological and physiological stress responses" View the study

  2. "The primary outcome measure, subjective stress response to multitasking cognitive stressor, was significantly reduced one hour after administration of the L-theanine drink when compared to placebo" View the study

Performance and Reaction Time

  1. "The results demonstrate the significant enhanced activity of alpha bands, descending heart rate, elevated visual attentional performance, and improved reaction time response among high anxiety propensity subjects compared to a placebo" View the study

  2. "The combination of moderate levels of L-theanine and caffeine significantly improved accuracy during task switching and self-reported alertness and reduced self-reported tiredness" View the study

Focus and Attention

  1. "L-Theanine and l-theanine-caffeine combination resulted in faster responses to targets compared with placebo" View the study

  2. "Brain theta waves, an indicator of cognitive alertness, were increased significantly in the temporal, frontal, parietal, and occipital areas after 3 hours in the eye-open and reading states" View the study

  3. "Mean RVRT [recognition visual reaction time] was significantly improved" View the study


  1. "L-theanine significantly increases activity in the alpha frequency band which indicates that it relaxes the mind without inducing drowsiness" View the study


  1. "The findings above denote that L-theanine not only reduces anxiety but also attenuates the blood-pressure increase in high-stress-response adults" View the study

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