Do you know how much caffeine is too much? Caffeine is the world's most ... drinks that have been on U.S. shelves for decades ...

Caffeine naturally occurs in tea and coffee, but it also sneaks into other foods and is added to many products. The maximum ...

But labels don't have to reveal how much caffeine the products pack. We will. We measured the amount in 27 top-selling energy drinks and shots (see table below). We bought the drinks online or at ...