How long does caffeine stay in your system?

A long time... It stays in your body longer than you might think. Half life of caffeine can be anywhere from three to seven hours which means it can stay in your system 5 times that long depending on your metabolism.

Related Questions

How long does caffeine stay in your system?

Variable. In general, it is short-acting, with a half-life of about 3 hours, but there may be genetic differences as well as drug/drug and drug/food interactions. Some people are very sensitive to some effects of caffeine, and consuming some in the morning may even interfere with sleep. Drugs like caffeine alter the receptor/neurotransmitter environment, and those effects may last longer than the drug. Read more...

How long does caffeine stay in your system? Drinking a cup of tea (61 mg caffeine) at 5PM -- will I be ok going to bed at 10PM.

Caffeine effect. It only takes 45 minutes for 99% of the caffeine to be absorbed through these membranes. In humans, the half-life for caffeine is anywhere from 4 to 6 hours on average, which explains why the average energy drink or coffee's effect lasts about 4 to 6 hours. so should be fine to sleep at 10. every individual is different and variations may be there. Read more...
Yes. Different people have different sensitivity to caffeine. You may try different doses and times of caffeine intake to ensure that it does not cause jitteriness or interfere with your sleep. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Read more...