It is good energy drink when you are studying and I used it too for, when I feeling sleepy in classes then used Red bull for waking me up and its really effective. you should also try but don’t try 1 more then a day. I used in class when I feel tired and not be able to concentrate more in studies, so go to the canteen and buy the redbull and have it just after few minutes you realise that you are now no more sleepy. so it works as I tried and having on regular basis.