Half-life ≈ 5 hours · why you can't sleep
☕ Caffeine in Your Blood
Log what you drank and when, then watch the caffeine curve in your blood drawn live. See how many mg are still in you right now, and whether you'll clear the safe threshold before bedtime.
1 · What did you drink?
2 · Your caffeine curve today
Model: one-compartment with ~45-min absorption ramp and adjustable half-life (4–6 h typical for adults; slower if pregnant or on some medications). Reference lines: 400 mg/day guidance for healthy adults and ~100 mg near bedtime often disturbs sleep (EFSA/FDA guidance). Figures are averages per serving — an estimate, not medical advice.