It’s ~6 hours. A person takes in 200mg at 6:00 each morning. They have 12.5mg in their system at 6:00 the next morning. The cycle continues. Each morning, they take in 200mg of caffeine and have more caffeine in their system than the day before until they have thousands of mgs of caffeine in their system. Yes?
In: Biology
It’s a general rule, but that’s not quite how it works. Your body is always trying to keep a certain balance of things like water, salt, sugar, acidity etc within itself. When you take in caffeine your body starts to immediately get rid of that from the moment it’s entered your bloodstream, mostly via the kidneys. They’re constantly filtering your blood and taking out stuff that it doesn’t want or has too much of. That just takes time. But due to the way that your kidneys work it’s easier to filter out stuff that there’s lots of, so if you ingest a lot of caffeine your kidneys can filter out more caffeine at once.
So yeah, maybe there is still some leftover caffeine in your blood the next morning, but consequently your body will excrete more caffeine so that it doesn’t slowly build up in your blood over time. Of course that only works if you keep drinking water, so stay hydrated folks!
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