foodnavigator-usa.com/Artic...
Hint water has PG! Not only does it have PG, this article really opened my eyes to the us of PG in any ingredient labeled as "natural flavors."
I'm no scientist, but here's what I gathered from reading: While the flavor may be originally be from a natural source, PG acts as the surfactant to spread that flavor around the food, giving it its yummy flavor. And PG is never on the label, only "natural flavors."