L-Theanine için Attention & Focus Difficulties

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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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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) Etki: None None

Popülasyon: 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 Etki: None None

Popülasyon: 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 Etki: None None

Popülasyon: 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 Etki: None p = 0.001

Popülasyon: 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 Etki: None None

Popülasyon: 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 Etki: None p = 0.040

Popülasyon: Children with ADHD

Key Statistics

Çalışmalar

1500

Katılımcılar

↑

Positive

Derece

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 atıf

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

BMC psychiatry 2024 12 atıf

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 atıf

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 atıf

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

Cureus 2021 20 atıf

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 atıf

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

Journal of psychiatric … 2019 46 atıf

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

Acta neuropsychiatrica 2017 84 atıf

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 atıf

Dosage & Usage

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

Yaygın Kullanılan Dozajlar

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

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

Araştırmalarda İncelenen Dozajlar

Dozaj	Süre	Etki	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

En iyi alım zamanı: Morning or as needed; rapid onset (30-60 minutes)

Safety & Side Effects

Bildirilen Yan Etkiler

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

Bilinen Etkileşimler

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

Tolere edilebilir üst alım: 900 mg/day (no adverse effects observed in studies)

Herhangi bir takviye kullanmaya başlamadan önce mutlaka sağlık uzmanınıza danışın.Herhangi bir takviye başlatmadan önce her zaman sağlık uzmanınıza danışın.

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.

Şu durum için diğer içerikler: Attention & Focus Difficulties

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

L-Theanine diğer sağlık durumları için

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

Hızlı Değerlendirme

Evidence Strength72%

High confidence

Çalışma Dağılımı

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

Alternatifleri Karşılaştır

Bu durum için diğer bileşenlerin nasıl karşılaştırıldığını görün.Diğer içeriklerin bu sağlık durumu için nasıl karşılaştırıldığını görün.

Şu durum için tüm içerikleri görüntüle: Attention & Focus Difficulties

Daha Fazla Bilgi

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 için Attention & Focus Difficulties

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Sonuç

Key Study Findings

Key Statistics

Referenced Papers

Dosage & Usage

Yaygın Kullanılan Dozajlar

Araştırmalarda İncelenen Dozajlar

Safety & Side Effects

Bildirilen Yan Etkiler

Bilinen Etkileşimler

Frequently Asked Questions

Related Evidence

Şu durum için diğer içerikler: Attention & Focus Difficulties

L-Theanine diğer sağlık durumları için

References