How Long Does Caffeine Stay in Your System?

The level of caffeine in your blood peaks about one hour later and stays at this level for several hours for most people. Six hours after caffeine is consumed, half of it is still in your body. It can take up to 10 hours to completely clear caffeine from your bloodstream.

How can I flush caffeine out of my system fast?

Here are a few ways to get rid of caffeine jitters quickly:
Water. An effective way to get rid of your jitters is to flush out your system with water. Exercise. You just crossed the caffeine line, which probably means you can’t sit still. Wait it out. Sip on some herbal tea. Amp up your Vitamin C game.

How long before caffeine is completely out of your system?

Wait it out

Caffeine’s stimulatory effects are usually noticeable within the first 45 minutes of intake and can last 3–5 hours ( 3 ). Moreover, it can take up to 10 hours for caffeine to completely clear your system ( 3 ). If you’re worried about sleep, it’s best to stop consuming caffeine 6–8 hours before bedtime.

According to the FDA, the half-life of caffeine is between four and six hours. This means that up to six hours after drinking a caffeinated beverage, half of the caffeine you consumed is still present in your body — keeping you alert. And, if it’s bedtime, keeping you from falling asleep.