Community observations, not medical advice.Always speak with a qualified healthcare professional.
supplement × Cognitive

L-Theanine for Focus & Concentration

Amino acid from tea leaves that crosses the blood-brain barrier and increases alpha-wave brain activity; promotes calm alertness without sedation, often paired with caffeine.

-published research: study records
-published research: findings
Not formally gradedcertainty of the research
On this pageOverviewEvidenceCommunity outcomesRelated
Why L-Theanine for Focus & Concentration?

The connection

Difficulty concentrating, brain fog, and attention issues. Increasingly common in the age of distraction.

Also known as: Theanine, L-gamma-glutamylethylamide

Published research

L-Theanine × Focus & Concentration: at a glance

Every published result for this pair, extracted and audited.

Published research

L-Theanine / Focus & Concentration: publication years

What this means: Counts describe research quantity, not treatment effectiveness or certainty.

L-Theanine / Focus & Concentration: publication years (publications, count)
CategoryPublications (count)
20221
20232
20242
20251
← Zoom out: all evidence for L-TheanineZoom out: compare compounds for Focus & Concentration →
Published research

L-Theanine × Focus & Concentration: the evidence base

Hand-selected PubMed studies, linked to the originals.

6studies referenced
5journals
2022–2025publication range

Ordered by strength of evidence, then result direction.

01Efficiency of Different Supplements in Alleviating Symptoms of ADHD with or Without the Use of Stimulants: A Systematic ReviewAl Shahab S, et al. · Nutrients · 2025PMID 40362791 ↗02Neurochemical and genetic factors in panic disorder: a systematic reviewMoraes ACN, et al. · Translational psychiatry · 2024PMID 39025836 ↗03The effects of L-theanine supplementation on the outcomes of patients with mental disorders: a systematic reviewMoshfeghinia R, et al. · BMC psychiatry · 2024PMID 39633316 ↗04Is Citicoline Effective in Preventing and Slowing Down Dementia?-A Systematic Review and a Meta-AnalysisBonvicini M, et al. · Nutrients · 2023PMID 36678257 ↗05Association between sleep pattern and pharmacological treatment in children with attention deficit disorder with hyperactivity: a systematic reviewRocha NS, et al. · Revista paulista de pediatria : orgao oficial da Sociedade de Pediatria de Sao Paulo · 2023PMID 37255110 ↗06Medicinal herbs for the treatment of anxiety: A systematic review and network meta-analysisZhang W, et al. · Pharmacological research · 2022PMID 35378276 ↗
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Community experiences

Contributors volunteered; this does not establish treatment effectiveness or population incidence.

Reported changes

No publishable community breakdown is available. This does not establish that no reports exist.

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Important: This page reflects observational, aggregate-only community reporting and independent published research. It is not medical advice, and it does not claim any compound treats, cures, or is effective for any condition. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or treatment.