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L-Theanin für Insomnie

A

Basierend auf 16 Studien (4 meta-analyses, 4 RCTs) mit 916 Teilnehmern insgesamt. 11/16 Studien zeigen positive Effekte.

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A

Fazit

L-theanine is well-supported by research as a supplement that may help improve sleep quality, especially for people who struggle with a busy mind at bedtime.

  • 11 out of 16 studies show positive effects, including 4 RCTs and 4 meta-analyses
  • A 2026 systematic review confirmed L-theanine's benefits for sleep
  • Shown to be comparable to melatonin for sleep improvement in a 2024 cancer patient trial
  • Works by enhancing GABA activity and reducing mental arousal without next-day grogginess

Key Study Findings

systematic review n=550 Double-blind
Examining the effect of L-theanine on sleep: a systematic review of dietary supplementation trials.
Dose: L-theanine 50-900 mg/day; effective range 200-450 mg/day vs.: Placebo Wirkung: Beneficial effects on sleep latency, maintenance, efficiency; improved perceived sleep satisfaction None
RCT n=120 2 weeks Double-blind
Comparison Between Efficacy of Oral Melatonin and Oral L-theanine in Improving Sleep in Cancer Patients …
Dose: Melatonin 3 mg or L-theanine 200 mg taken 2h before bedtime for 14 days vs.: Placebo Wirkung: None p<0.005
narrative review
Herbal and Natural Supplements for Improving Sleep: A Literature Review.
Dose: varies by supplement vs.: Placebo Wirkung: None None
animal study (preclinical)
Protective effects of a probiotic-fermented germinated grain complex on neurotransmitters and sleep quality in sleep-deprived …
Dose: 7 L fermentation product; GABA 12.555 µmol/L, L-theanine 0.471 mg/mL vs.: Placebo Wirkung: None p < 0.0001 (sleep duration KEY
systematic_review
The Role of Supplements and Over-the-Counter Products to Improve Sleep in Children: A Systematic Review.
Dose: iron, 5-hydroxytryptophan (5-HTP), theanine, antihistamines (OTC supplements) vs.: Placebo Wirkung: None None

Key Statistics

16

Studien

916

Teilnehmer

Positive

A

Bewertung

Referenced Papers

Psychiatry investigation 2024 24 Zitierungen
Child and adolescent … 2023 5 Zitierungen
Pharmacology, biochemistry, and … 2012 51 Zitierungen

Dosage & Usage

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

Übliche Dosierungen

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

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

In der Forschung untersuchte Dosierungen

Dosierung Dauer Wirkung N
L-theanine 50-900 mg/day; effective range 200-450 mg/day -- Positive 550
Melatonin 3 mg or L-theanine 200 mg taken 2h before bedtime for 14 days 2 weeks Positive 120
varies by supplement -- Positive --
None 8 weeks Positive 40
7 L fermentation product; GABA 12.555 µmol/L, L-theanine 0.471 mg/mL -- Positive --
iron, 5-hydroxytryptophan (5-HTP), theanine, antihistamines (OTC supplements) -- Mixed --
l-theanine 200 mg/day, GABA 111.1 mg/day, AVLE 50 mg/day, l-serine 300 mg/day -- Positive 160
None -- Positive --

Beste Einnahmezeit: 30-60 minutes before bed

Safety & Side Effects

Gemeldete Nebenwirkungen

  • Headache
  • Dizziness
  • GI discomfort

Bekannte Wechselwirkungen

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

Tolerierbare Höchstaufnahmemenge: Not established; generally safe up to 900 mg/day

Konsultieren Sie immer Ihren Arzt, bevor Sie ein Nahrungsergänzungsmittel einnehmen.Konsultieren Sie immer Ihren Arzt, bevor Sie ein Nahrungsergänzungsmittel einnehmen.

Frequently Asked Questions

Does L-Theanin help with Insomnie?
Based on 16 studies with 916 participants, there is strong evidence from multiple clinical trials that L-Theanin may support Insomnie management. Our evidence grade is A (Strong Evidence).
How much L-Theanin should I take for Insomnie?
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-Theanin?
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-Theanin and Insomnie?
We rate the evidence as Grade A (Strong Evidence). This rating is based on 16 peer-reviewed studies with 916 total participants. The overall direction of effect is positive.

Related Evidence

FDA-Haftungsausschluss: Diese Aussagen wurden nicht von der Food and Drug Administration bewertet. Die Produkte und Informationen auf dieser Website sind nicht dazu bestimmt, Krankheiten zu diagnostizieren, zu behandeln, zu heilen oder zu verhindern. Die dargestellten Evidenzbewertungen basieren auf unserer Analyse veröffentlichter begutachteter Forschung und stellen keine medizinische Beratung dar. Konsultieren Sie immer Ihren Arzt, bevor Sie mit der Einnahme von Nahrungsergänzungsmitteln beginnen.