How long does it take coffee to kick in?

In this text, we are going to discuss “how long it takes for coffee to kick in” after consumption. Also, we are going to discuss what happens to caffeine when it enters your body and how long caffeine stays in your body.

How long does it take coffee to kick in?

20 minutes! A cup of coffee may take just 20 minutes to reach the bloodstream and about 1 hour to reach full effectiveness. However, this can vary for people who are already used to drinking coffee!

Many people wake up in the morning and quickly seek the first dose of coffee to be able to wake up for good. This effect is due to caffeine, a phytochemical with a stimulant action capable of increasing alertness and concentration. 

And the effects of the substance can help those who exercise to have more gas in training. The compound has gained so much attention in recent decades that it has been the subject of hundreds of studies.

What happens to caffeine in your body?

Caffeine in your body starts in the bloodstream after 10 minutes of your drinking it. This causes an increase in heart rate, blood pressure and energy. Interestingly, this effect is most noticeable in men. However, it also occurs in women.

After 20 minutes, caffeine starts to affect your adenosine levels. Adenosine is a neurotransmitter that tells the body it’s time to sleep. Caffeine – which is structurally very similar to adenosine – binds to the brain’s adenosine receptors and deactivates them.

This allows your brain stimulants dopamine and glutamate to do their work, which is why you start feeling optimistic after 20 minutes.

After 30 minutes, your body starts producing more adrenaline in response to caffeine. Adrenaline increases your energy production even more. It also dilates the airways and increases blood flow to the muscles. Thus, your physical performance gains a big boost after 30 minutes.

40 minutes after your first sip, you should start to notice your mood pick up. This is because caffeine is starting to increase your brain’s sensitivity to serotonin – the neurotransmitter responsible for regulating mood.

Caffeine further increases your dopamine levels.Consequently, your feelings of contentment should increase. This is because caffeine further increases your dopamine levels. After 3 hours, the effect of caffeine on your energy starts to wane. You may start to notice a change. 

Unless you’re well rested, after three hours your body will say “Wow, I’m really tired.”

After 6 hours, your brain has largely forgotten about the coffee. But your body hasn’t yet. After 6 hours, caffeine starts to work as a diuretic. 

How long does coffee stay in our body?

Well, if it’s quick to take effect, then it should be about the same time for us to eliminate it from our body. That’s where you’re wrong, my dear friend, after all, the body normally takes 3 to 5 hours to eliminate HALF of the substance and it takes between 8 and 14 hours for the body to be completely free of caffeine. 

How does caffeine act in the body?

It is known that caffeine has a direct effect on the central nervous system, making us more alert. In moderate doses, the substance can bring a number of benefits to the body, including improving memory and concentration, in addition to helping mental health as a whole. 

Coffee – which, due to its large consumption, ends up being one of the main sources of caffeine – has already been associated with a decrease in the risk of Alzheimer’s and some types of cancer.

On the other hand, excessive amounts of caffeine can increase heart rate, cause insomnia, anxiety and other side effects. Among those who consume the substance regularly, lack of the stimulant can result in headaches and irritability.

Once in the body, caffeine quickly starts triggering reactions: within 45 minutes it is absorbed, processed and free to circulate in the bloodstream.

The peak of the effects of caffeine occurs within 5 hours of ingestion, and it may take up to 40 hours to be completely eliminated from the body. 

In addition to genetics, factors such as age, weight, health condition, mood status also influence how the body reacts to the presence of the substance.

Studies have yet to conclude exactly that genetic variations are responsible for how long caffeine stays in the body, but it is known that a specific gene variation called PDSS2 processes caffeine more slowly, making the effect last longer.

Other FAQs about Coffee that you may be interested in.

How long does it take to grow coffee beans?

How many cups of coffee a day?

How long is cold brew coffee good for in the fridge?


In this text, we discussed “how long it takes for coffee to kick in” after consumption. Additionally, we discussed what happens to caffeine when it enters your body and how long caffeine stays in your body.


Hi, I am Charlotte, I love cooking and in my previous life, I was a chef. I bring some of my experience to the recipes on this hub and answer your food questions.