L-Theanine cho Attention & Focus Difficulties

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 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.

Related Evidence

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)

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