The sugar-free version of Red Bull contains no fructose or dextrose, but is flavored with two sugar substitutes, Acesulfame-K and aspartame, to reduce calories, but the rest of the ingredients are the same.

Red Bull contains a high dose of caffeine (a typical cup of black coffee contains 80 to 180 milligrams of caffeine), which, combined with the fact that it is often mixed with vodka, a high-alcohol spirit, raises the risk of consumption. To date there has not been any scientific evidence to definitively state that Red Bull is problematic in terms of health and safety, but what is certain is that excessive consumption of either any highly caffeinated beverage or food product can be harmful. In addition, although taurine was initially found in cows, the main source of taurine is mostly synthetic. Taurine is a substance originally contained in the human brain, and when it is deficient, it can cause a feeling of fatigue, so taurine supplementation can be used to achieve a refreshing effect, and in addition to the intake of trace amounts of taurine is also beneficial to the body. But if you take too much taurine instantly whether it will cause malabsorption or health problems, so far scientists have not found a definite conclusion.