Salt

Convincing humans to artificially iodize salt is a great feat of the Ahrimanic beings.  He (the human) changes his ability to know his own self.........Fluoride (and iodine and chlorine) is a halogen. Halogens make it simpler for beings to gain access to the human self and possess it.  p 130 Nature Spirits and What They Say: Interviews with Verena Stael Von Holstein by Wolfgang Weirauch