Is 99.7% VG too impure to be safe for health?
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I think that's one of the controversies. From my understanding, inhalants need to be pharmacetical grade, however that is hard to come by and very expensive. Food grade is next in line and that's what everyone is using. It sounds as if there's a range within food grade but what that is, I don't know. This is one of those things I'd like to know more about.