Caffeine plus L-theanine improved test performance in a small wrestler trial
The combination produced better results on several short-term tests, but the study cannot establish lasting performance gains or general safety.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The combined supplement improved several physical test results compared with placebo and produced the highest wrestling-test throw count among the tested conditions. Cognitive results also favored the combination on some comparisons. The trial offers a short-term signal in elite male wrestlers. It does not establish better competition results or safe long-term use.
Only 12 wrestlers were studied, and effects were measured during acute testing. The abstract supplies significance tests but no performance effect sizes or confidence intervals; its anxiety percentages also lack a clear definition.
What researchers found
Specific Wrestling Fitness Test
Caffeine plus L-theanine versus placebo, caffeine alone and L-theanine alone, during testing beginning 60 minutes after supplementation.
What else changed
After the wrestling test, the combination improved Stroop reaction time compared with placebo and L-theanine alone, and accuracy compared with placebo. These are results from a computerized task, so their relevance to actual matches remains untested.
How to read safety claims
Caffeine alone increased state anxiety relative to placebo. The combination had lower reported anxiety than placebo and fewer rapid-heartbeat reports than caffeine alone. Brief observations in a small, selected group do not establish overall safety.
The original publication
Performance-enhancing effects of caffeine and L-Theanine among Iranian elite wrestlers: a focus on cognitive and specific physical performance.
Razazan R, Hemmatinafar M, Imanian B et al.
J Int Soc Sports Nutr · 2025
- PubMed ID
- 40977612
- Record checked
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