{"version":"1.0","type":"card","id":"b0f82eae-d55e-4cc7-87de-1304b10bce58","url":"https://stacklist.com/card/b0f82eae-d55e-4cc7-87de-1304b10bce58","title":"Higher-Dose Caffeine + L-Theanine: Sharper, Less Tired","source_url":"https://pubmed.ncbi.nlm.nih.gov/18006208/","note":"Biological Psychology trial testing 150mg caffeine with 250mg L-theanine: the pair improved reaction speed and working memory and lowered tiredness and headache ratings.","image":{"url":"https://ucarecdn.com/e8e408a0-9bda-4619-814d-1533826b8ac1/","alt":"Higher-Dose Caffeine + L-Theanine: Sharper, Less Tired","width":1024,"height":683},"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":"2026-11-02T22:10:49.289Z","updated_at":null,"aco":{"summary":"This randomized, double-blind, placebo-controlled study examined the cognitive and mood effects of L-theanine (250 mg) and caffeine (150 mg) in isolation and combination. The combination improved reaction time, visual processing accuracy, mental fatigue ratings, and alertness while reducing headaches, suggesting L-theanine and caffeine beverages have a different pharmacological profile than caffeine alone.","tags":["caffeine","l-theanine","cognitive-performance","clinical-trial","neuroscience","mood-effects","drug-interaction"],"key_entities":[{"name":"L-Theanine","type":"concept","confidence":0.99},{"name":"Caffeine","type":"concept","confidence":0.99},{"name":"Cognitive Performance","type":"concept","confidence":0.95},{"name":"Mental Fatigue","type":"concept","confidence":0.93},{"name":"Rapid Visual Information Processing","type":"concept","confidence":0.92},{"name":"Drug Interaction","type":"concept","confidence":0.9},{"name":"Double-Blind Randomized Controlled Trial","type":"technology","confidence":0.94}],"classification":"reference","language":"en","confidence":0.85,"provenance":{"model":"claude-haiku-4-5","tool":"@stacklist/mcp-server@2.0.0","confidence":0.85,"timestamp":"2026-11-02T22:10:55.222Z"},"token_counts":{"approximate":1004,"cl100k":785},"content_hash":"sha256:6f4d03c73dc84ea42f17fa76d08d35447562bb577aebbd710ea463572ea63633","acp_version":"0.2","body_available":true,"body_tokens":1004,"visibility":"public","agent_accessible":true,"status":"final"},"_links":{"self":"/api/public/card/b0f82eae-d55e-4cc7-87de-1304b10bce58.json","html":"https://stacklist.com/card/b0f82eae-d55e-4cc7-87de-1304b10bce58","md":"/api/public/card/b0f82eae-d55e-4cc7-87de-1304b10bce58.md","stack_json":"/api/public/stack/ed5a3ae2-37d9-4b9f-acfb-16fc78c07ec8.json"}}