L-Theanine per Insonnia

Q: Does L-Theanine help with Insonnia?

Based on 16 studies with 916 participants, there is strong evidence from multiple clinical trials that L-Theanine may support Insonnia management. Our evidence grade is A (Strong Evidence).

Q: How much L-Theanine should I take for Insonnia?

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.

Q: 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.

Q: How strong is the evidence for L-Theanine and Insonnia?

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.

Basato su 16 studi (4 meta-analyses, 4 RCTs) con 916 partecipanti totali. 11/16 studi mostrano effetti positivi.

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In sintesi

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 Effetto: 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 Effetto: None p<0.005

narrative review

Herbal and Natural Supplements for Improving Sleep: A Literature Review.

Dose: varies by supplement vs: Placebo Effetto: None None

RCT n=40 8 weeks Double-blind

Dietary supplementation with Lactium and L-theanine alleviates sleep disturbance in adults: a double-blind, randomized, placebo-controlled …

Dose: None vs: Placebo Effetto: 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 Effetto: 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 Effetto: None None

Key Statistics

Studi

916

Partecipanti

↑

Positive

Grado

Referenced Papers

Examining the effect of L-theanine on sleep: a systematic review of dietary supplementation trials. Systematic Review

Nutritional neuroscience 2026

Herbal and Natural Supplements for Improving Sleep: A Literature Review. Other

Psychiatry investigation 2024 24 citazioni

Protective effects of a probiotic-fermented germinated grain complex on neurotransmitters and sleep quality in sleep-deprived mice. Other

Frontiers in microbiology 2024 13 citazioni

Dietary supplementation with Lactium and L-theanine alleviates sleep disturbance in adults: a double-blind, randomized, placebo-controlled clinical study. Other

Frontiers in nutrition 2024 5 citazioni

Comparison Between Efficacy of Oral Melatonin and Oral L-theanine in Improving Sleep in Cancer Patients Suffering From Insomnia: A Randomised … Other

Indian journal of … 2024 3 citazioni

The Role of Supplements and Over-the-Counter Products to Improve Sleep in Children: A Systematic Review. Systematic Review

International journal of … 2023 14 citazioni

Analysis of the Effects of Known Sleep-Support Supplements in Relation to Life Habits, Sleep Conditions, and Sleep Problems. RCT

Nutrients 2023 6 citazioni

Complementary and Integrative Approaches to Sleep Disorders in Children. Review

Child and adolescent … 2023 5 citazioni

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

Pharmacological research 2022 51 citazioni

A comprehensive review on bioavailability, safety and antidepressant potential of natural bioactive components from tea. Review

Food research international … 2022 46 citazioni

GABA and l-theanine mixture decreases sleep latency and improves NREM sleep. Other

Pharmaceutical biology 2019 134 citazioni

L-theanine in the adjunctive treatment of generalized anxiety disorder: A double-blind, randomised, placebo-controlled trial. RCT

Journal of psychiatric … 2019 46 citazioni

Safety, Tolerability and Efficacy of Drugs for Treating Behavioural Insomnia in Children with Attention-Deficit/Hyperactivity Disorder: A Systematic Review with Methodological … Systematic Review

Paediatric drugs 2017 26 citazioni

To sleep or not to sleep: a systematic review of the literature of pharmacological treatments of insomnia in children and … Systematic Review

Journal of child … 2013 56 citazioni

L-theanine partially counteracts caffeine-induced sleep disturbances in rats. Other

Pharmacology, biochemistry, and … 2012 51 citazioni

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

Medical science monitor … 2009 85 citazioni

Dosage & Usage

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

Dosaggi di uso comune

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

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

Dosaggi studiati nella ricerca

Dosaggio	Durata	Effetto	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	--

Momento migliore per l'assunzione: 30-60 minutes before bed

Safety & Side Effects

Effetti collaterali segnalati

⚠ Headache
⚠ Dizziness
⚠ GI discomfort

Interazioni note

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

Livello di assunzione massimo tollerabile: Not established; generally safe up to 900 mg/day

Consultare sempre il proprio medico prima di iniziare qualsiasi integratore.Consultate sempre il vostro medico prima di iniziare qualsiasi integratore.

Frequently Asked Questions

Does L-Theanine help with Insonnia?

Based on 16 studies with 916 participants, there is strong evidence from multiple clinical trials that L-Theanine may support Insonnia management. Our evidence grade is A (Strong Evidence).

How much L-Theanine should I take for Insonnia?

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 Insonnia?

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

Altri ingredienti per Insonnia

Melatonin A Radice di valeriana A CBD A Acidi grassi Omega-3 A Triptofano A Vitamina D A

L-Theanine per altre condizioni

Difficoltà di addormentamento A Problemi di sonno legati all'ansia B

Verdetto rapido

Basato su 16 studi (4 meta-analyses, 4 RCTs) con 916 partecipanti totali. 11/16 studi mostrano effetti positivi.

Evidence Strength92%

High confidence

Analisi degli studi

RCT (2)Meta (1)Other (13)

Confronta le alternative

Scoprite come si confrontano altri ingredienti per questa condizione.

Visualizza tutti gli ingredienti per Insonnia

Approfondimenti

Avvertenza FDA: Queste affermazioni non sono state valutate dalla Food and Drug Administration. I prodotti e le informazioni presenti su questo sito web non sono destinati a diagnosticare, trattare, curare o prevenire alcuna malattia. I gradi di evidenza presentati si basano sulla nostra analisi della ricerca pubblicata e sottoposta a revisione paritaria e non costituiscono consulenza medica. Consultate sempre il vostro medico prima di iniziare qualsiasi regime di integrazione.