I agree w/ you caedmyn about the internal usage of oils. I’m nearly finished with an online class about essential oil safety, usage, dosage, and general info, and I was surprised to learn that there actually have been reputable scientific studies on the safety and efficacy of internal use of some essential oils.
In fact, a 2009 study documented the impact of lavender and peppermint oils and their antibacterial abilities internally. It was found that lavender oil had the capability to destroy harmful gut bacteria and leave the beneficial bacteria alone. But peppermint did not distinguish between the types of gut flora, and destroyed both. Yet, DT and YL (and lots of blogs too) advocate for regular internal use of peppermint oil.
I am not against internal use of oils at all, but I don’t think it should be a regular occurence by any means. These companies promote the usage of something for lay people that most of them won’t take the time to study so they can make educated choices for themselves. No matter which company of EOs you choose, I hope everyone takes the time to educate themselves about the properties of each oil, how it is safe and recommended to use them, and dosage and dilution. There are sources for third-party information and studies. You have to dig for it (or enroll in a class like I did) to find it, but it’s worth the effort. I should mention that the class I’m taking is not affiliated with any oil company.