It has been extensively studied that Red Bull increases performance which is proven by e.g. the following digest of papers:

1. Ivy J.L. et al., Cycling time trial performance improved by ingestion of a caffeine energy drink, International Journal of Sports Nutrition and Exercise Metabolism 19, 61-78, (2009)
2. Alford C. et al., The Effects of Red Bull Energy Drink on Human Performance and Mood, Amino Acids 21, 2, 139 – 150 (2001)
3. Geiss K.R. et al., The effect of a taurine-containing drink on performance in 10 endurance-athletes, Amino Acids 7, 1, 45-56 (1994)
4. Baum M., Weiß M., The influence of a taurine containing drink on cardiac parameters before and after exercise measured by echocardiography, Amino Acids 20, 1, 75-82 (2001)