Strong evidenceamino_acid
L-Theanine for Lack of Focus
L-theanine increases alpha brain wave activity, promoting a state of calm alertness. It modulates glutamate, GABA, serotonin, and dopamine levels, enhancing sustained attention without the jitteriness of stimulants.
How strong is the research?
Strong evidence
Based on a randomised controlled trial (RCT) — the gold standard for establishing cause and effect.
Research source
SourceOwen GN et al. · Nutritional Neuroscience 2008How much to take
100–200 mg
Can be taken with caffeine (100mg theanine + 50mg caffeine) for synergistic focus benefits. Safe to take multiple times daily.