Clare, save the next can and read the ingredient list. any additives will be in there, then consult the list on this site of the different ones as to whether they are ok or not.
It must have something in it to make it taste sweet, so, some kind of sweetener, plus doesn't Red Bull have lots of caffeine? You would need to look at the ingredients.
You can find out about additives, just Google 'The Worst Additives', and there is a list.
Sylvia x
