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According to energyfiend.com, 127.92 cans of Red Bull will kill a 150 pound person. http://www.energyfiend.com/death-by-caffeine/
All depends on your body weight and metabolism. It's probably best to not drink any more than 3 in a 24 period. Also remember that large amounts of caffeinated drinks can lead to painful kidney stones.

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7y ago

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