[soko]

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You can't have any caffeinated drinks in boxing or MMA type events. The fluids that are issued in your corner need to be accepted by the state athletic commissions. If you were to drink a redbull before a boxing match, the effects will last you maybe a round or two, and you better hope you knock that guy out because when you crash, you're not going to worth anything.

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This is interesting if true, considering Xyience energy drink is a major sponsor of UFC and MMA in general, Most fighters are required to take a drink after their fight this may have little to do with what they drink during and before their fights but still, the perception is that it's supposed to help fighters.