we've had egg whites in the US for a few years now...you poor UK people.
all it should be is egg whites. a machine separates the yolks.
check the ingredients for other stuff like salt or flavoring..shouldn't be there (EggBeaters is just egg whites, some spices ,and some starch to thicken it up to mimic whole eggs).
Some egg whites are pasteurized, and those are safe to drink. if its not pasteurized, don't drink it, or you risk salmonella.