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

L-Theanine for Sleep Issues

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 Sleep Issues?

The connection

Difficulty falling asleep, staying asleep, or poor sleep quality. Insomnia affects ~30% of adults.

Also known as: Theanine, L-gamma-glutamylethylamide

Published research

L-Theanine × Sleep Issues: at a glance

Every published result for this pair, extracted and audited.

Published research

L-Theanine / Sleep Issues: publication years

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

L-Theanine / Sleep Issues: publication years (publications, count)
CategoryPublications (count)
20243
20252
20261
← Zoom out: all evidence for L-TheanineZoom out: compare compounds for Sleep Issues →
Published research

L-Theanine × Sleep Issues: the evidence base

Hand-selected PubMed studies, linked to the originals.

6studies referenced
5journals
2024–2026publication range

Ordered by strength of evidence, then result direction.

01The effects of oral cannabidiol supplementation on blood pressure in adults: a systematic review of randomised controlled trialsRoberts A, et al. · Journal of cannabis research · 2026PMID 42321899 ↗02Efficiency 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 ↗03Dysregulation of melatonin rhythm in Parkinson's and Huntington's disease: a systematic review and meta-analysisSuram RP, et al. · Frontiers in aging neuroscience · 2025PMID 41143249 ↗04Effects of Dietary Supplementation in Patients with Restless Legs Syndrome: A Systematic ReviewGonzález-Parejo P, et al. · Nutrients · 2024PMID 39064758 ↗05The effects of L-theanine supplementation on the outcomes of patients with mental disorders: a systematic reviewMoshfeghinia R, et al. · BMC psychiatry · 2024PMID 39633316 ↗06Sleep disturbances and female infertility: a systematic reviewLi J, et al. · BMC women's health · 2024PMID 39707272 ↗
Search PubMed ↗View on PubChem ↗Find clinical trials ↗

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.