L-Theanine für Attention & Focus Difficulties

B Evidenz Mindestens eine randomisierte Studie unterstützt dies, mit überwiegend konsistenten Ergebnissen.

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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Fazit

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) Wirkung: 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 Wirkung: 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 Wirkung: 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 Wirkung: 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 Wirkung: 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 Wirkung: None p = 0.040

Population: Children with ADHD

Key Statistics

Studien

1500

Teilnehmer

↑

Positive

Bewertung

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 Zitierungen

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

BMC psychiatry 2024 12 Zitierungen

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 Zitierungen

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 Zitierungen

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

Cureus 2021 20 Zitierungen

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 Zitierungen

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

Journal of psychiatric … 2019 46 Zitierungen

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

Acta neuropsychiatrica 2017 84 Zitierungen

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 Zitierungen

Dosage & Usage

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

Übliche Dosierungen

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

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

In der Forschung untersuchte Dosierungen

Dosierung	Dauer	Wirkung	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

Beste Einnahmezeit: Morning or as needed; rapid onset (30-60 minutes)

Safety & Side Effects

Gemeldete Nebenwirkungen

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

Bekannte Wechselwirkungen

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

Tolerierbare Höchstaufnahmemenge: 900 mg/day (no adverse effects observed in studies)

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-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.

Andere Inhaltsstoffe für Attention & Focus Difficulties

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

L-Theanine für andere Beschwerden

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

Kurzfazit

Evidence Strength72%

High confidence

Studienübersicht

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

Alternativen vergleichen

Sehen Sie, wie andere Inhaltsstoffe bei dieser Beschwerde abschneiden.

Alle Inhaltsstoffe ansehen für Attention & Focus Difficulties

Mehr erfahren

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

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L-Theanine für Attention & Focus Difficulties

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Fazit

Key Study Findings

Key Statistics

Referenced Papers

Dosage & Usage

Übliche Dosierungen

In der Forschung untersuchte Dosierungen

Safety & Side Effects

Gemeldete Nebenwirkungen

Bekannte Wechselwirkungen

Frequently Asked Questions

Related Evidence

Andere Inhaltsstoffe für Attention & Focus Difficulties

L-Theanine für andere Beschwerden

References