What is the recommended dosage for L-Theanine?

General: 100-200 mg/day; With Caffeine: 200 mg L-theanine + 100 mg caffeine

What are the side effects of L-Theanine?

Potential side effects include: Generally very well-tolerated, Mild drowsiness in sensitive individuals, Mild headache (rare).

L-theanine is an amino acid found primarily in green and black tea. It has been studied for its ability to promote alpha brain wave activity, which is associated with a state of calm alertness. Research suggests it may support attention, focus, and relaxation without sedation.

What dosage of L-Theanine has been used in studies?

Clinical studies have commonly used 100 mg to 400 mg of L-theanine daily. A popular research dose is 200 mg taken once or twice daily. Some studies have combined L-theanine with caffeine for synergistic effects on attention. Consult your healthcare provider for guidance.

What are the potential side effects of L-Theanine?

L-theanine has a strong safety profile and is generally well tolerated. Rare side effects may include headache and gastrointestinal discomfort. It may enhance the effects of blood pressure-lowering medications. Consult your healthcare provider if you take antihypertensive drugs.

L-Theanine
L-Theanine

amino_acid

別名: Theanine, Gamma-Glutamylethylamide, Suntheanine

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About

L-Theanine is an amino acid found primarily in green tea that crosses the blood-brain barrier to increase alpha brainwave activity associated with calm alertness. The L-theanine + caffeine combination is one of the most replicated nootropic pairings, consistently showing improvements in attention, task switching, and alertness without jitteriness.

How It Works

Crosses the blood-brain barrier and increases alpha brainwave activity associated with calm alertness; enhances GABA, serotonin, and dopamine levels; synergizes with caffeine to improve attention without jitteriness; reduces glutamate excitotoxicity.

Evidence For Conditions

症状・状態	グレード	研究数	参加者数
Attention & Focus Difficulties	B	20	1500	詳細を見る →
Anxiety-Related Cognitive Impairment	C	8	500	詳細を見る →
Sleep-Related Cognitive Impairment	C	6	400	詳細を見る →

Side Effects

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

Drug & Supplement Interactions

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

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Related Ingredients

N-Acetyl Cysteine Taurine Acetyl-L-Carnitine

基本情報

用量: General: 100-200 mg/day; With_Caffeine: 200 mg L-theanine + 100 mg caffeine
剤形: capsule tablet powder
天然の供給源: Green tea (Camellia sinensis), Certain mushrooms
上限量: 900 mg/day (no adverse effects observed in studies)
推奨摂取タイミング: Morning or as needed; rapid onset (30-60 minutes)

エビデンスの要約

Attention & Focus Difficulties B

Anxiety-Related Cognitive Impairment C

Sleep-Related Cognitive Impairment C

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