L-Theanine pour Attention & Focus Difficulties

B Preuves Au moins un essai randomisé le soutient, avec des résultats globalement concordants.

The L-theanine + caffeine combination is one of the most replicated nootropic pairings in cognitive research, consistently showing improvements in attention, task switching, and alertness without jitteriness.

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En conclusion

Key Study Findings

Systematic Review

Efficiency of Different Supplements in Alleviating Symptoms of ADHD with or Without the Use of …

Dose: None vs: Placebo or methylphenidate Outcome: ADHD symptom severity (inattention, hyperactivity) Effet: None None

Population: ADHD patients (systematic review of supplements)

Systematic Review

The effects of L-theanine supplementation on the outcomes of patients with mental disorders: a systematic …

Dose: None vs: None Outcome: Anxiety symptoms Effet: None None

Population: Schizophrenia patients

Systematic Review

Association between sleep pattern and pharmacological treatment in children with attention deficit disorder with hyperactivity: …

Dose: None vs: None Outcome: sleep quality Effet: None None

Population: Children

Randomized Controlled Trial 4.3 weeks Single-blind

Assessing brain function in stressed healthy individuals following the use of a combination of green …

Dose: None vs: placebo Outcome: Brain response to stress and quality of life Effet: None p = 0.001

Population: Chronically stressed but healthy subjects

Systematic Review 884 weeks

The Cognitive-Enhancing Outcomes of Caffeine and L-theanine: A Systematic Review.

Dose: 9.4% vs: None Outcome: None Effet: None None

Population: None

Randomized Controlled Trial

Effects of L-theanine-caffeine combination on sustained attention and inhibitory control among children with ADHD: a …

Dose: 2.5 mg/kg vs: Placebo Outcome: None Effet: None p = 0.040

Population: Children with ADHD

Key Statistics

Études

1500

Participants

↑

Positive

Note

Referenced Papers

Efficiency of Different Supplements in Alleviating Symptoms of ADHD with or Without the Use of Stimulants: A Systematic Review. Systematic Review

Nutrients 2025 1 citations

The effects of L-theanine supplementation on the outcomes of patients with mental disorders: a systematic review. Systematic Review

BMC psychiatry 2024 12 citations

Association between sleep pattern and pharmacological treatment in children with attention deficit disorder with hyperactivity: a systematic review. Systematic Review

Revista paulista de … 2023 3 citations

Assessing brain function in stressed healthy individuals following the use of a combination of green tea, Rhodiola, magnesium, and B … Other

Frontiers in nutrition 2023 3 citations

The Cognitive-Enhancing Outcomes of Caffeine and L-theanine: A Systematic Review. Review

Cureus 2021 20 citations

Effects of L-theanine-caffeine combination on sustained attention and inhibitory control among children with ADHD: a proof-of-concept neuroimaging RCT. RCT

Scientific reports 2020 34 citations

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

Journal of psychiatric … 2019 46 citations

Effects of chronic l-theanine administration in patients with major depressive disorder: an open-label study. Other

Acta neuropsychiatrica 2017 84 citations

The effects of L-theanine (Suntheanine®) on objective sleep quality in boys with attention deficit hyperactivity disorder (ADHD): a randomized, double-blind, … RCT

Alternative medicine review … 2011 82 citations

Dosage & Usage

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

Posologies couramment utilisées

general:: 100-200 mg/day
withcaffeine:: 200 mg L-theanine + 100 mg caffeine

Limite supérieure : 900 mg/day (no adverse effects observed in studies)

Posologies étudiées dans la recherche

Posologie	Durée	Effet	N
None	--	Mixed	--
None	--	Positive	--
None	--	Mixed	--
None	4.3 weeks	Positive	--
9.4%	884 weeks	Positive	--
2.5 mg/kg	--	Negative	--
450-900 mg L-theanine daily	10 weeks	Neutral	46
250 mg/day	8 weeks	Positive	20

Moment optimal de prise : Morning or as needed; rapid onset (30-60 minutes)

Safety & Side Effects

Effets indésirables signalés

⚠ Generally very well-tolerated
⚠ Mild drowsiness in sensitive individuals
⚠ Mild headache (rare)

Interactions connues

● Antihypertensive drugs (may enhance blood pressure lowering)
● Stimulant medications (counteracts some stimulant side effects)
● Sedative medications (additive calming effects)

Apport maximal tolérable : 900 mg/day (no adverse effects observed in studies)

Consultez toujours votre professionnel de santé avant de commencer tout complément alimentaire.Consultez toujours votre professionnel de santé avant de commencer tout complément alimentaire.

Frequently Asked Questions

Does L-Theanine help with Attention & Focus Difficulties?

Based on 20 studies with 1,500 participants, there is moderate evidence from clinical studies that L-Theanine may support Attention & Focus Difficulties management. Our evidence grade is B (Good Evidence).

How much L-Theanine should I take for Attention & Focus Difficulties?

Studies have used various dosages. A commonly studied range is 100-200 mg/day. Always consult your healthcare provider before starting any supplement regimen.

Are there side effects of L-Theanine?

Reported side effects may include Generally very well-tolerated, Mild drowsiness in sensitive individuals, Mild headache (rare). 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 Attention & Focus Difficulties?

We rate the evidence as Grade B (Good Evidence). This rating is based on 20 peer-reviewed studies with 1,500 total participants. The overall direction of effect is positive.

Autres ingrédients pour Attention & Focus Difficulties

Citicoline B Omega-3 Fatty Acids (DHA/EPA) C Bacopa monnieri C Phosphatidylserine C

L-Theanine pour d'autres pathologies

Anxiety-Related Cognitive Impairment C Sleep-Related Cognitive Impairment C

Verdict rapide

Evidence Strength72%

High confidence

Synthèse des études

RCT (3)Meta (0)Other (17)

Comparer les alternatives

Découvrez comment d'autres ingrédients se comparent pour cette condition.Découvrez comment d'autres ingrédients se comparent pour cette pathologie.

Voir tous les ingrédients pour Attention & Focus Difficulties

En savoir plus

References

[1] Shatha Al Shahab et al.. Nutrients. 2025. Efficiency of Different Supplements in Alleviating Symptoms of ADHD with or Without the Use of Stimulants: A Systematic Review. doi:10.3390/nu17091482 PubMed
[2] Reza Moshfeghinia et al.. BMC Psychiatry. 2024. The effects of L-theanine supplementation on the outcomes of patients with mental disorders: a systematic review. doi:10.1186/s12888-024-06285-y PubMed
[3] Nathalia Sena Rocha et al.. Rev Paul Pediatr. 2023. Association between sleep pattern and pharmacological treatment in children with attention deficit disorder with hyperactivity: a systematic review. doi:10.1590/1984-0462/2023/41/2022065 PubMed
[4] Gisèle Pickering et al.. Front Nutr. 2023. Assessing brain function in stressed healthy individuals following the use of a combination of green tea, Rhodiola, magnesium, and B … doi:10.3389/fnut.2023.1211321 PubMed
[5] Anas Anas Sohail et al.. Cureus. 2021. The Cognitive-Enhancing Outcomes of Caffeine and L-theanine: A Systematic Review. doi:10.7759/cureus.20828 PubMed
[6] Chanaka N Kahathuduwa et al.. Sci Rep. 2020. Effects of L-theanine-caffeine combination on sustained attention and inhibitory control among children with ADHD: a proof-of-concept neuroimaging RCT. doi:10.1038/s41598-020-70037-7 PubMed
[7] Jerome Sarris et al.. J Psychiatr Res. 2019. L-theanine in the adjunctive treatment of generalized anxiety disorder: A double-blind, randomised, placebo-controlled trial. doi:10.1016/j.jpsychires.2018.12.014 PubMed
[8] Shinsuke Hidese et al.. Acta Neuropsychiatr. 2017. Effects of chronic l-theanine administration in patients with major depressive disorder: an open-label study. doi:10.1017/neu.2016.33 PubMed
[9] Michael R Lyon et al.. Altern Med Rev. 2011. The effects of L-theanine (Suntheanine®) on objective sleep quality in boys with attention deficit hyperactivity disorder (ADHD): a randomized, double-blind, … PubMed

Avertissement FDA: Ces déclarations n'ont pas été évaluées par la Food and Drug Administration. Les produits et informations sur ce site ne sont pas destinés à diagnostiquer, traiter, guérir ou prévenir quelque maladie que ce soit. Les notes de preuve présentées sont basées sur notre analyse de la recherche publiée et évaluée par des pairs et ne constituent pas un avis médical. Consultez toujours votre professionnel de santé avant de commencer tout régime de compléments alimentaires.

L-Theanine pour Attention & Focus Difficulties

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En conclusion

Key Study Findings

Key Statistics

Referenced Papers

Dosage & Usage

Posologies couramment utilisées

Posologies étudiées dans la recherche

Safety & Side Effects

Effets indésirables signalés

Interactions connues

Frequently Asked Questions

Related Evidence

Autres ingrédients pour Attention & Focus Difficulties

L-Theanine pour d'autres pathologies

References