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All I know is everyone always says to not heat them, and since it's wholly unnecessary to heat them, I've never really taken the time to research further. So perhaps that is one of those things that get repeated without evidence. I'll have to read when I have time A lot of oils are steam distilled but there are also ones that aren't.Is that really true? I believe that many EO’s are extracted by steam distillation, which is reasonably harsh and uses heat. If they can survive that, and I know they can, I fail to see why they can’t be heated.
That being said, I am with Garet on EO’s being (for the most part) little more than snake oil.
ETA: I should add that heating would be largely useless anyway since most terpene and other components of plant oils (these are largely what plant oils are made of) have high-ish boiling points and you probably wouldn’t be able volatilise a lot of it below 100oC.