Caffeine TrackerCaffeine journalCAFFEINE JOURNAL
Understand every milligram you consume.
Evidence-based explanations of coffee and caffeine, from mechanisms to intake guidance. New articles are added regularly.
t½ ≈ 5h02
Sleep guide
How long does caffeine stay in your system? Half-life and sleep
Estimate what remains after each five-hour half-life and find a better cutoff for your last cup.
Read articleC₈H₁₀N₄O₂01
Essential guide
What is caffeine? Effects, benefits, risks and amounts in common foods
Learn how caffeine promotes alertness, its benefits and side effects, and approximate amounts in common foods and drinks.
Read article