Seems its not recommended to consume more then 2 cans of Red Bulls per day. I also came across the following notice.
Cautions: Contains caffeine. Not recommended for children, pregnant or breast-feeding women, caffeine sensitive persons or to be mixed with alcohol. Do not consume more than 500 ml per day.A friend warned me about it, and that was the reason why I looked into it. This can't be. I mean why is always have to be this way. Things you like and enjoy always seem to be bad for you? This is not possible.