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EO is extracted product(s) from natural ingredient(s).
FO is human-made.
Keep in mind that "natural" doesn't necessarily mean "better" or "healthier". For example, some vehicles or extracting substances can be very irritating.
But, to me, FO are the most common ofender, in my case. I get bad allergies and general irritation of the nose and lungs from many many artificial fragrances, and some EO.
I have been using unscented shaving soaps almost exclusively for a couple years. I love a quality scent, but those are hard to find and tend to be expensive.