L-theanine reduces psychological and physiological stress responses
Kimura K, Ozeki M, Juneja LR, Ohira H
Published in Biological Psychology
Methodology
Placebo-controlled crossover experiment giving L-theanine 200 mg before an acute mental arithmetic stress task, measuring heart rate, salivary immunoglobulin A and subjective stress.
Key Findings
L-theanine reduced heart rate and salivary IgA responses to the acute stressor and attenuated sympathetic nervous activation.
Conclusions
L-theanine blunts the acute physiological stress response.
Limitations
Very small sample of young adults; single acute dose; laboratory stressor only.
Supplements Studied
L-theanine reduced heart rate and salivary IgA responses to an acute stressor and attenuated sympathetic activation.
Outcomes Measured
L-theanine attenuated physiological stress responses to an acute mental task.
Related Health Concerns
Study Details
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Disclosures
Funding
Ingredient manufacturer (Taiyo Kagaku) collaboration
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