I am one of the fortunates who is not allergic to it and don't notice any aftertaste/taste. Although honestly, I'm moving more and more towards just using sugar -- better to honestly monitor my sweets intake instead of all those chemicals! -- except this takes away EVERY SINGLE non-water thing I drink. >_<;; Given that I can't justify drinking normal soda, and honestly think it's rather vile -- I prefer the diet versions for the few sodas I will drink.