According to the Mayo Clinic, an average healthy adult can safely consume up to 400 mg of caffeine a day. You might be surprised how quickly you can reach that number: Just two Starbucks drip coffees will put you over the limit.
The graphics below offer an inside look at the caffeine content of a variety of popular drinks. Where exact caffeine measurements were not available from manufacturers, we relied on estimates from the Center for Science in the Public Interest.
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