L-Theanine for Anxiety-Related Sleep Problems

Based on 2 studies (1 meta-analysis). 2/2 studies show positive effects.

𝕏 LinkedIn

<\/script>\n

`; }, get iframeSnippet() { const domain = 'sleepcited.com'; const params = 'ingredient\u003Dl\u002Dtheanine\u0026condition\u003Danxiety\u002Drelated\u002Dsleep'; return ``; }, get activeSnippet() { return this.method === 'script' ? this.scriptSnippet : this.iframeSnippet; }, copySnippet() { navigator.clipboard.writeText(this.activeSnippet).then(() => { this.copied = true; setTimeout(() => { this.copied = false; }, 2000); }); } }" @keydown.escape.window="open = false" @click.outside="open = false">

Embed This Widget

Style

Widget powered by . Free, no account required.

The Bottom Line

L-theanine may help improve sleep when anxiety is a factor, but the specific evidence for this use is limited to just two positive studies.

Both studies show positive effects, but the evidence base is small
L-theanine promotes relaxation by boosting alpha brain waves without causing drowsiness
Found naturally in green and black tea — a familiar and well-tolerated compound
Grade B evidence — promising direction but needs more dedicated research

Key Study Findings

Meta-Analysis

Medicinal herbs for the treatment of anxiety: A systematic review and network meta-analysis.

Dose: Various medicinal herbs: Silexan, Kava, Ginkgo biloba, Withania somnifera, Galphimia glauca, Passion vs: Placebo Effect: Silexan MD -3.84 (95% CrI -6.31 to -1.34); Kava MD -2.46 (95% CrI -4.47 to -0.32); Ginkgo biloba MD None

Key Statistics

Studies

Participants

↑

Positive

Grade

Referenced Papers

Medicinal herbs for the treatment of anxiety: A systematic review and network meta-analysis. Meta-Analysis

Pharmacological research 2022 51 citations

Formulations of dietary supplements and herbal extracts for relaxation and anxiolytic action: Relarian. Review

Medical science monitor … 2009 85 citations

Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

Commonly Used Dosages

sleep:: 200-400 mg, 30-60 min before bed

Upper limit: Not established; generally safe up to 900 mg/day

Dosages Studied in Research

Dosage	Duration	Effect	N
Various medicinal herbs: Silexan, Kava, Ginkgo biloba, Withania somnifera, Galphimia glauca, Passion	--	Positive	--

Best taken: 30-60 minutes before bed

Safety & Side Effects

Reported Side Effects

⚠ Headache
⚠ Dizziness
⚠ GI discomfort

Known Interactions

● Blood pressure medications — L-theanine may lower blood pressure
● Stimulants (caffeine) — may partially counteract stimulant effects
● Sedatives — potential additive calming effects

Tolerable upper intake: Not established; generally safe up to 900 mg/day

Always consult your healthcare provider before starting any supplement.

Frequently Asked Questions

Does L-Theanine help with Anxiety-Related Sleep Problems?

Based on 2 studies with 0 participants, there is moderate evidence from clinical studies that L-Theanine may support Anxiety-Related Sleep Problems management. Our evidence grade is B (Good Evidence).

How much L-Theanine should I take for Anxiety-Related Sleep Problems?

Studies have used various dosages. A commonly studied range is 200-400 mg, 30-60 min before bed. Always consult your healthcare provider before starting any supplement regimen.

Are there side effects of L-Theanine?

Reported side effects may include Headache, Dizziness, GI discomfort. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.

How strong is the evidence for L-Theanine and Anxiety-Related Sleep Problems?

We rate the evidence as Grade B (Good Evidence). This rating is based on 2 peer-reviewed studies with 0 total participants. The overall direction of effect is positive.

Related Evidence

L-Theanine for other conditions

Insomnia A Sleep Onset Difficulty A

Quick Verdict

Based on 2 studies (1 meta-analysis). 2/2 studies show positive effects.

Evidence Strength72%

High confidence

Study Breakdown

RCT (0)Meta (1)Other (1)

Compare Alternatives

See how other ingredients compare for this condition.

View all ingredients for Anxiety-Related Sleep Problems

Learn More

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.