Caffeine helps to improve concentration and increase alertness. One 250-ml can of Red Bull Energy Drink contains 80 mg of caffeine. The 80 mg of caffeine contained in one 250-ml can of Red Bull ...

The new energy drink features zero sugar and its own unique taste.

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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 ...