how long does caffeine stay in your system for
As long as caffeine is in your blood, it's effects will also manifest. The time it takes for the body to eliminate one half of a caffeine dose is normally between 3 to 12 hours. It is called the half-life of caffeine.
Caffeine takes a certain amount of time to work through your system. One study some years ago showed that the half-life of caffeine in healthy adults is 5.7 hours (see source). This means if you consume 200mg of caffeine at mid-day, you would still have 100mg in you at around 5.45pm.irst, you’re right about caffeine having a half-life of around 6 hours. If you consume 200 mg of caffeine, you’d still have 100 mg in you after 6 hours. Compromised liver function increases half-life by slowing metabolism.