L-Theanine para Insomnio

Q: Does L-Theanine help with Insomnio?

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

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

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 Insomnio?

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.

Basado en 16 estudios (4 meta-analyses, 4 RCTs) con 916 participantes en total. 11/16 estudios muestran efectos positivos.

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Conclusión

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 Efecto: 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 Efecto: None p<0.005

narrative review

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

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

Key Statistics

Estudios

916

Participantes

↑

Positive

Calificación

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 citas

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

Frontiers in microbiology 2024 13 citas

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 citas

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 citas

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

International journal of … 2023 14 citas

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

Nutrients 2023 6 citas

Complementary and Integrative Approaches to Sleep Disorders in Children. Review

Child and adolescent … 2023 5 citas

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

Pharmacological research 2022 51 citas

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

Food research international … 2022 46 citas

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

Pharmaceutical biology 2019 134 citas

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

Journal of psychiatric … 2019 46 citas

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 citas

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 citas

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

Pharmacology, biochemistry, and … 2012 51 citas

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

Medical science monitor … 2009 85 citas

Dosage & Usage

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

Dosificaciones de uso común

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

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

Dosificaciones estudiadas en la investigación

Dosificación	Duración	Efecto	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	--

Mejor momento para tomar: 30-60 minutes before bed

Safety & Side Effects

Efectos secundarios reportados

⚠ Headache
⚠ Dizziness
⚠ GI discomfort

Interacciones conocidas

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

Ingesta máxima tolerable: Not established; generally safe up to 900 mg/day

Consulte siempre a su profesional de salud antes de comenzar cualquier suplemento.Siempre consulte a su profesional de salud antes de comenzar cualquier suplemento.

Frequently Asked Questions

Does L-Theanine help with Insomnio?

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

How much L-Theanine should I take for Insomnio?

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 Insomnio?

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

Otros ingredientes para Insomnio

Melatonin A Raíz de Valeriana A CBD A Ácidos Grasos Omega-3 A Tryptophan A Vitamina D A

L-Theanine para otras condiciones

Dificultad para Conciliar el Sueño A Problemas de Sueño por Ansiedad B

Veredicto rápido

Basado en 16 estudios (4 meta-analyses, 4 RCTs) con 916 participantes en total. 11/16 estudios muestran efectos positivos.

Evidence Strength92%

High confidence

Desglose de estudios

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

Comparar alternativas

Vea cómo se comparan otros ingredientes para esta condición.

Ver todos los ingredientes para Insomnio

Más información

Aviso legal FDA: Estas declaraciones no han sido evaluadas por la Food and Drug Administration. Los productos y la información en este sitio web no están destinados a diagnosticar, tratar, curar ni prevenir ninguna enfermedad. Las calificaciones de evidencia presentadas se basan en nuestro análisis de investigación publicada revisada por pares y no constituyen consejo médico. Siempre consulte a su profesional de salud antes de comenzar cualquier régimen de suplementos.