The directions also advise people to limit caffeine products and to drink only half the bottle if they want a moderate amount of energy.

VOA: special.2009.07.22

There, the only defense against your own caffeine-amped angst is your sense of humor and the just-as-crazy team (you got to be, right?) working diligently alongside you.

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But the benefit was only half as big as that for caffeine.

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To date, caffeine has been approved for use only in soft drinks, and only at concentrations under 200 parts per million.

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