This is the bane of my existence. I am allergic to several extremely common ingredients/preservatives.

I can lead a regular if culinarily boring life if I simply avoid these ingredients. But anything can hide in this phrase "Natural Flavors."

The only way I can know if I am allergic to something is to try it, and even then there are threshold issues and changing ingredients. Just because something is made a certain way today, doesn't mean it will be tomorrow.