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L-Theanine + Caffeine Beat Caffeine Alone on Attention
L-Theanine combined with caffeine improves attention-switching performance and reduces distractibility more effectively than caffeine alone in healthy volunteers. The study compared 50 mg caffeine with and without 100 mg L-theanine across multiple cognitive tasks, demonstrating synergistic benefits for cognitively demanding performance.
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Summary
L-Theanine combined with caffeine improves attention-switching performance and reduces distractibility more effectively than caffeine alone in healthy volunteers. The study compared 50 mg caffeine with and without 100 mg L-theanine across multiple cognitive tasks, demonstrating synergistic benefits for cognitively demanding performance.
Tags
caffeine · l-theanine · attention · cognition · drug-interaction · clinical-trial · cognitive-performance
Key entities
L-Theanine (concept, 0.95) · Caffeine (concept, 0.95) · Attention-switching task (concept, 0.9) · Cognitive performance (concept, 0.9) · Drug interaction (concept, 0.85) · Rapid visual information processing (concept, 0.85)
Classification
reference · language en · status final
Provenance
claude-haiku-4-5 via @stacklist/mcp-server@2.0.0, confidence 0.85, 2 Nov 2026