Just a new-forum user doing my homework. Replying with my anecdotal comment – I mixed eucalyptus, lavender, peppermint, and rosemary with carrier oil based upon a “recipe” I had from the authors of this book:
The essential oils apothecary : advanced strategies and protocols for chronic disease and conditions / Eric Zielinski, D.C., and Sabrina Ann Zielinski.
I shared some with my mother in a roller bottle and kept the rest in a washed out vanilla extract glass bottle (because it is amber colored). I never received any feedback on it from my mother. However, when my bunion hurts I spend a bit of time rubbing my foot with the oil and it seems to help.