Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis
Camfield DA, Stough C, Farrimond J
Published in Nutrition Reviews
Methodology
Systematic review and meta-analysis of randomized controlled trials of L-theanine, caffeine and EGCG on cognition and mood.
Key Findings
Caffeine with L-theanine improved attention-switching accuracy and alertness in the first 1-2 hours after dosing.
Conclusions
Caffeine plus L-theanine gives modest short-term attention benefits.
Limitations
Acute dosing only; no evidence for sustained decision-making capacity.
Supplements Studied
L-theanine in combination with caffeine improved attention-switching accuracy and alertness within the first two hours of administration.
Outcomes Measured
Caffeine with L-theanine improved attention-switching accuracy and alertness in the first 1-2 hours after dosing.
Related Health Concerns
Study Details
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