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Supplements · Timing & Precision
Caffeine Countdown
Is your 3pm coffee still in your blood at midnight?
Half-life math decides. Most people guess catastrophically wrong.
3–4 min Core Science Score /100
Caffeine's half-life is ~5–6 hours. Set your last-cup cutoff so that bedtime levels stay under the sleep-disruption threshold.
Educational only — not medical advice.
Companion Peer-Reviewed Article
Caffeine Half-Life Calculator
This interactive challenge was designed around peer-reviewed clinical research published on Health Secrets. Dive deeper into the biological mechanisms, human trial data, and practical implementation protocols.
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