en.wikipedia.org/wiki/Red_Bull
It's all marketing myth and hype, Red Bull has the same caffeine content as a cup of coffee, it isn't banned, it has nocardio vascular effects.
Cardiovascular effects
A review of the scientific literature on caffeine concluded that moderate caffeine intake (less than 400 mg per day) does not adversely affect cardiovascular health.[24] A can of Red Bull, 250ml, contains 80 mg of caffeine which is less than a cup of coffee.[25]
There has been at least one case report of Red Bull overdose causing postural orthostatic tachycardia syndrome in a young athlete.[26] A February 3, 2009 article in The Daily Telegraph called, "Red Bull 'may have triggered heart condition that killed student' " reported the death of a 21-year-old woman who died after drinking four cans of Red Bull as well as alcohol at "social levels".[27] It was believed, but had not been proven, that she suffered from a rare heart condition called long QT Syndrome.[27] She was on medication for epilepsy and had an abnormally large heart. A medical examination found that there were no illegal drugs in her system. The article quoted a doctor as saying, "The coroner recorded that the 21-year-old woman died of natural causes."[28]
Impact on driving
Joris Verster and colleagues from Utrecht University concluded that Red Bull Energy Drink reduces driver sleepiness and enhances driving performance during prolonged highway driving.[29]
Legal status
Red Bull did not get market approval in France, Denmark, and Norway[30] for several years, but the energy drink is now on sale in all 27 member states of the European Union and in 164 countries around the world.