{"claimId":"clm_ec_b1-theanine-cog","version":1,"status":"current","verdict":"L-Theanine for cognition: Grade C at moderate certainty. improves attention and reduces distraction, especially combined with caffeine","direction":"benefit","magnitude":{"metric":"other","value":null,"unit":"","ci95":null,"humanReadable":"improves attention and reduces distraction, especially combined with caffeine","baselineAbsoluteRisk":null},"certainty":"moderate","clinicalMeaning":"small_but_potentially_useful","applicability":{"appliesTo":["adults"],"doesNotApply":["children"],"unknown":["pregnancy"]},"safetyQualifiers":[],"evidenceBundleId":"eb_ec_b1-theanine-cog","citations":[{"pmid":"20000107"}],"reviewedBy":{"name":"Substrate editorial","credential":"Independent research collective"},"reviewedAt":"2026-07-14T00:00:00Z","dateModified":"2026-07-14T00:00:00Z","methodologyVersion":"v1","methodologyDoi":"https://doi.org/10.5281/zenodo.21364236","canonicalUrl":"https://evidencebased.info/interventions/theanine/cognition","attribution":"Substrate (evidencebased.info), claim clm_ec_b1-theanine-cog v1, reviewed 2026-07-14","license":"CC-BY-4.0 — attribution with link required"}