How long does caffeine really stay in your system?

There’s definitely a lot of individual variation. But knowing the half-life of caffeine is useful…especially if you actually understand what the half-life of a substance actually means. Related episodes: # 620: Is coffee good or bad for you? # 414 What is brewed cacao? # 361: How to find coffee that won’t bother your stomach Find a transcript here. New to Nutrition Diva? Send an email to nutrition@quickanddirtytips.com.