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Half-life is how long your body needs to clear half of a dose. Enter any dose and half-life to see how much is left later, and how long until it is effectively gone.
The maths is exact: remaining equals dose multiplied by 0.5 raised to the power of time divided by half-life. The listed half-lives are typical adult averages from published pharmacokinetics and vary widely between people; caffeine alone ranges from roughly 2 to 9 hours. Educational information, not medical advice.
Half-life explains why one stimulant clears before lunch and another is still with you at bedtime. Five half-lives is the usual rule of thumb for a compound being effectively gone.
Typical adult averages from published pharmacokinetics; individual values vary widely, and caffeine alone ranges from roughly 2 to 9 hours. Theobromine is the long-lasting stimulant in chocolate.
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