Assuming you are talking about a can of Red Bull that is 8.4 fluid ounces, or 241 ml, there are 27 grams of sugar in one can. This equates to approximately 6 and 1/3 teaspoons of sugar. The vast majority of the sugar in a can of Red Bull comes from sucrose, which is table sugar. There is also some fructose, which is fruit sugar, as well as glucose and dextrin, which are types of complex carbohydrates.