The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review
Williams JL, Everett JM, D'Cunha NM, Sergi D, Georgousopoulou EN, Keegan RJ, McKune AJ, Mellor DD, Anstice N, Naumovski N
Published in Plant Foods for Human Nutrition
Methodology
Systematic review of randomised controlled trials of L-theanine (typically 200-400 mg/day) on acute and chronic stress and anxiety outcomes in adults.
Key Findings
L-theanine at 200-400 mg/day reduced stress and anxiety in people exposed to stressful conditions, with little effect in individuals under low baseline stress.
Conclusions
L-theanine appears useful for acute stress reactivity rather than as a general anxiolytic.
Limitations
Small heterogeneous trials, varied stressors and instruments, short durations.
Supplements Studied
L-theanine at 200-400 mg/day reduced stress and anxiety in people exposed to stressful conditions.
Outcomes Measured
L-theanine at 200-400 mg/day reduced stress and anxiety under stressful conditions.
The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review
L-theanine reduced acute stress and anxiety in stress-inducing settings but had little effect on chronic clinical anxiety
L-theanine reduced acute stress and anxiety in stress-inducing settings
L-theanine showed little effect on chronic anxiety despite acute stress-response benefits
Related Health Concerns
Study Details
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Disclosures
Funding
Academic (University of Canberra)
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