{"version":"1.0","type":"card","id":"c9cf6726-e89a-470a-a2e7-40634ba11ea1","url":"https://stacklist.com/card/c9cf6726-e89a-470a-a2e7-40634ba11ea1","title":"L-Theanine + Caffeine Beat Caffeine Alone on Attention","source_url":"https://pubmed.ncbi.nlm.nih.gov/18681988/","note":"Nutritional Neuroscience crossover trial: 50mg caffeine with 100mg L-theanine improved speed and accuracy on attention switching and cut distraction more than caffeine alone.","image":{"url":"https://ucarecdn.com/7c438265-6a44-4ddf-98ba-e73d6121977b/","alt":"L-Theanine + Caffeine Beat Caffeine Alone on Attention","width":1200,"height":675},"stack":{"id":"ed5a3ae2-37d9-4b9f-acfb-16fc78c07ec8","title":"Calm Focus for Finals: LSC100 + Studying, Exam Season & ADHD Focus","url":"https://stacklist.com/c/education/stack/ed5a3ae2-37d9-4b9f-acfb-16fc78c07ec8"},"created_at":"2026-11-02T22:10:48.139Z","updated_at":null,"aco":{"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":[{"name":"L-Theanine","type":"concept","confidence":0.95},{"name":"Caffeine","type":"concept","confidence":0.95},{"name":"Attention-switching task","type":"concept","confidence":0.9},{"name":"Cognitive performance","type":"concept","confidence":0.9},{"name":"Drug interaction","type":"concept","confidence":0.85},{"name":"Rapid visual information processing","type":"concept","confidence":0.85}],"classification":"reference","language":"en","confidence":0.85,"provenance":{"model":"claude-haiku-4-5","tool":"@stacklist/mcp-server@2.0.0","confidence":0.85,"timestamp":"2026-11-02T22:10:53.192Z"},"token_counts":{"approximate":680,"cl100k":541},"content_hash":"sha256:d20b7b58937c79849c2704b47f79c5513478cf875e98e819e15d3741a94f31f4","acp_version":"0.2","body_available":true,"body_tokens":680,"visibility":"public","agent_accessible":true,"status":"final"},"_links":{"self":"/api/public/card/c9cf6726-e89a-470a-a2e7-40634ba11ea1.json","html":"https://stacklist.com/card/c9cf6726-e89a-470a-a2e7-40634ba11ea1","md":"/api/public/card/c9cf6726-e89a-470a-a2e7-40634ba11ea1.md","stack_json":"/api/public/stack/ed5a3ae2-37d9-4b9f-acfb-16fc78c07ec8.json"}}