Caffeine is estimated to be the most widely used legal psychoactive drug in the world. About 85% of US adults consume caffeine daily, averaging about 135 mg per day, or about a 12 fl oz cup of coffee. This video explores what caffeine is and some ways it affects our bodies.

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0:00 Introduction
0:54 What is caffeine?
2:28 How long does caffeine stay in the body?
3:34 How much is too much caffeine?
5:21 Caffeine tolerance and dependence
6:47 Caffeine overdose and toxicity
7:37 1200 mg of caffeine