meta_analysis
2025
High Quality
Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Unknown authors
Published in Nutr Rev
Key Findings
L-theanine combined with caffeine improved attention and alertness, whereas L-theanine alone had minimal cognitive effects.
Conclusions
The combination, not L-theanine alone, drives alertness benefits.
Supplements Studied
Tea and its bioactive compounds improved measures of cognition and mood in healthy participants.
L-Theanine
Amino Acid
L-theanine plus caffeine improved attention and alertness, while L-theanine alone had minimal cognitive effects.
Outcomes Measured
Afternoon Slump Prevention
Primary
L-theanine combined with caffeine improved attention and alertness, whereas L-theanine alone had minimal cognitive effects.
Study Details
Year:2025
Quality Score:8/10
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