L-Theanine cho 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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Kết luận

Key Study Findings

Systematic Review

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

Dose: None so với: Placebo or methylphenidate Outcome: ADHD symptom severity (inattention, hyperactivity) Hiệu quả: None None

Đối tượng nghiên cứu: 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 so với: None Outcome: Anxiety symptoms Hiệu quả: None None

Đối tượng nghiên cứu: Schizophrenia patients

Systematic Review

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

Dose: None so với: None Outcome: sleep quality Hiệu quả: None None

Đối tượng nghiên cứu: 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 so với: placebo Outcome: Brain response to stress and quality of life Hiệu quả: None p = 0.001

Đối tượng nghiên cứu: Chronically stressed but healthy subjects

Systematic Review 884 weeks

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

Dose: 9.4% so với: None Outcome: None Hiệu quả: None None

Đối tượng nghiên cứu: 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 so với: Placebo Outcome: None Hiệu quả: None p = 0.040

Đối tượng nghiên cứu: Children with ADHD

Key Statistics

Nghiên cứu

1500

Người tham gia

↑

Positive

Xếp hạng

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 trích dẫn

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

BMC psychiatry 2024 12 trích dẫn

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 trích dẫn

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 trích dẫn

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

Cureus 2021 20 trích dẫn

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 trích dẫn

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

Journal of psychiatric … 2019 46 trích dẫn

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

Acta neuropsychiatrica 2017 84 trích dẫn

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 trích dẫn

Dosage & Usage

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

Liều lượng thường dùng

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

Giới hạn trên: 900 mg/day (no adverse effects observed in studies)

Liều lượng đã nghiên cứu

Liều lượng	Thời gian	Hiệu quả	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

Thời điểm dùng tốt nhất: Morning or as needed; rapid onset (30-60 minutes)

Safety & Side Effects

Tác dụng phụ đã được báo cáo

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

Tương tác đã biết

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

Mức hấp thụ tối đa cho phép: 900 mg/day (no adverse effects observed in studies)

Luôn tham khảo ý kiến bác sĩ trước khi bắt đầu sử dụng bất kỳ thực phẩm bổ sung nào.Luôn tham khảo ý kiến chuyên gia y tế trước khi sử dụng bất kỳ thực phẩm chức năng nào.

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.

Các thành phần khác cho Attention & Focus Difficulties

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

L-Theanine cho các tình trạng khác

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

Đánh giá nhanh

Evidence Strength72%

High confidence

Phân tích nghiên cứu

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

So sánh lựa chọn thay thế

Xem các thành phần khác so sánh như thế nào cho tình trạng này.

Xem tất cả thành phần cho Attention & Focus Difficulties

Tìm hiểu thêm

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 cho Attention & Focus Difficulties

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Kết luận

Key Study Findings

Key Statistics

Referenced Papers

Dosage & Usage

Liều lượng thường dùng

Liều lượng đã nghiên cứu

Safety & Side Effects

Tác dụng phụ đã được báo cáo

Tương tác đã biết

Frequently Asked Questions

Related Evidence

Các thành phần khác cho Attention & Focus Difficulties

L-Theanine cho các tình trạng khác

References