Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial
Hidese S, Ogawa S, Ota M, Ishida I, Yasukawa Z, Ozeki M, Kunugi H
Published in Nutrients
Methodology
Randomized, placebo-controlled, crossover trial of L-theanine 200 mg/day for four weeks in healthy adults without major psychiatric illness, assessing stress, sleep and cognition.
Key Findings
L-theanine reduced stress-related symptoms including sleep-latency, sleep disturbance and use of sleep medication scores, and improved verbal fluency and executive function in a subgroup analysis.
Conclusions
Four weeks of L-theanine may reduce stress-related symptoms and support cognitive function in healthy adults.
Limitations
Small crossover sample; several outcomes exploratory; partly funded by an ingredient manufacturer.
Supplements Studied
L-theanine reduced stress-related symptoms including sleep latency and sleep disturbance, and improved verbal fluency and executive function.
Outcomes Measured
L-theanine reduced sleep latency, sleep disturbance and stress-related symptom scores.
L-theanine reduced sleep latency, sleep disturbance and stress-related symptom scores.
Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial
L-theanine reduced stress-related symptoms including sleep-latency, sleep disturbance and use of sleep medication scores, and improved verbal fluency and executive function in a subgroup analysis.
L-theanine reduced stress-related symptoms including sleep-latency, sleep disturbance and use of sleep medication scores, and improved verbal fluency and executive function in a subgroup analysis.
Related Health Concerns
Study Details
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Disclosures
Funding
Japanese academic funding with support from an ingredient manufacturer
This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.