What is L-Theanine used for?

L-Theanine is commonly used for: Anxiety Relief, Sleep Quality, Mood Support. These uses are supported by scientific evidence at various levels.

Does L-Theanine have interactions?

Yes, L-Theanine has 4 known interaction(s). Always consult a healthcare provider before combining supplements.

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L-Theanine

Moderate Evidence

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Overview

Form: capsule
Category: Amino Acid

Reduces anxiety without drowsiness; synergistic with caffeine

Supported Health Goals

Anxiety Relief

Moderate Evidence

Reduction of anxiety symptoms and stress management

Multiple studies show anxiety reduction

Sleep Quality

Moderate Evidence

Improve sleep onset, duration, and quality

Studies show sleep quality improvement

Mood Support

Moderate Evidence

Support balanced mood and emotional wellbeing

Anxiety reduction, mood support

Scientific Studies (3)

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.

Primary

Nutrients· 2019· n=30· rct

Reduced stress-related symptoms and improved cognitive function vs placebo

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The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review.

Plant Foods Hum Nutr· 2020· systematic review

L-theanine reduces stress and anxiety, particularly under acute stress

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Anti-Stress, Behavioural and Magnetoencephalography Effects of an L-Theanine-Based Nutrient Drink: A Randomised, Double-Blind, Placebo-Controlled, Crossover Trial.

Nutrients· 2016· n=18· rct

Reduced stress response during cognitive stressor task

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Safety & Interactions

moderate Interaction

L-Theanine smooths caffeine's stimulant effects, improving focus without jitters

Recommendation: Recommended stack: 100-200mg L-Theanine + 50-100mg caffeine

moderate Interaction

Melatonin helps sleep onset, L-Theanine promotes relaxation

Recommendation: Good sleep stack combination

moderate Interaction

Enhanced relaxation and anxiety reduction

Recommendation: Good daytime anxiety support

moderate Interaction

Enhanced anxiety and stress reduction

Recommendation: Good anxiety support combination

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