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l-theanine: From tea leaf to trending supplement
L-theanine is a non-protein amino acid from tea leaves that has gained popularity as a dietary supplement for brain health and relaxation, though scientific evidence remains limited. While some studies suggest potential benefits for alpha waves, stress reduction, and cognitive performance when combined with caffeine, rigorous human clinical trials are lacking and the science does not yet match the marketing hype.
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Summary
L-theanine is a non-protein amino acid from tea leaves that has gained popularity as a dietary supplement for brain health and relaxation, though scientific evidence remains limited. While some studies suggest potential benefits for alpha waves, stress reduction, and cognitive performance when combined with caffeine, rigorous human clinical trials are lacking and the science does not yet match the marketing hype.
Tags
l-theanine · brain-health · dietary-supplement · cognitive-function · green-tea · relaxation · clinical-trials
Key entities
Roderick Dashwood (person, 0.95) · Francesco Visioli (person, 0.95) · Texas A&M University (organization, 0.95) · University of Padova (organization, 0.95) · IMDEA-Food (organization, 0.9) · l-theanine (concept, 0.99) · epigallocatechin-3-gallate (EGCG) (concept, 0.9) · Texas (location, 0.95) · Italy (location, 0.95) · Spain (location, 0.95)
Classification
analysis · language en · status final
Provenance
claude-haiku-4-5 via @stacklist/be@0.1.0, confidence 0.85, 18 Aug 2026