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    Energy drinks are all the rage among not just athletes but also young adults. And hundreds of varieties are available. These drinks claim to make you more alert and boost your sports performance. But do they really work and, more importantly, are they safe? Some energy drinks have as much caffeine as five cups of coffee -- or 10 times as much as a can of cola. Many also contain large amounts of sugar. Follow the links below to find WebMD's comprehensive coverage of energy drinks, what's in them, which ones to stay away from, and much more.

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    Energy products abound: in drinks, herbs, bars, and even goo. But do they do anything?

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    Ensure you're exercising hard enough to get a good workout, but not strain your heart.

    While you are exercising, you should count between...

    -
    Beats
    PER
    Seconds