Peppermint essential oil is one of the more common essential oils. It’s plentiful and inexpensive, and the minty coolness it brings to our products is most welcome (except when we’re soaking in it! Eek!) Peppermint essential oil is composed of 38% to 48% menthol (a monoterpene), 20% to 30% menthone, and about 6% 1,8-cineole (aka eucalyptol, which we…