I use a LOT of EOs in my skin care products. So far, I have found Edens Garden to be the best and their CS is great, you do have to email request for MSDS, and I did like the Frankincense I ordered from EG. I love anything I can afford from Organic Infusions (they are pricey and only sell Organic oils etc, and are FDA Certified to do so) also sells some very good Pure Certified Organic EOs. I've ordered EOs also from BA, but EG is just better scent for the Fr and Myrrh, and passes the drip test. For me, BA is great for other things. EO, not so much.
What shunt and the others stated about "therapeutic" EOs is true and very correct. I have researched that topic to the N'th degree.
If you already know this, then pardon please, but The truest test of a pure EO that has not been cut, is the drop test. Drip a drop of the EO on plain white printer paper. IF it evaporates without leaving a oily residue, then it will be a pure EO. IF it has been adulterated, or, cut, by the use of a carrier oil, then it will leave an oily spot which you can touch with finger and feel that oily slip.