Lots of great info and a helpful perspective. Many thanks for your trouble. Re lavender, I'm female, so I don't worry about being made less male. Ha ha ha. What you say is interesting: lavender as far as I can remember is seen as a feminine, perfumy type of scent. No man would have been caught dead smelling of lavender. Good call, Herbalist.
Yes, you are right when the sellers of essential oils say to never take them internally, ie, they are covering their assses. However, DoTerra at one place on their site says to not use it internally; yet elsewhere, see the following, they appear to actually encourage it.
"One of Frankincense’s most powerful benefits is its ability to promote health, specifically cellular function.* Try taking this essential oil internally by adding one to two drops in a Veggie capsule. This natural supplement will help support healthy cellular function.* In fact, doTERRA has found Frankincense oil to be so beneficial in supporting cellular function that doTERRA uses it in their highest selling supplements—the doTERRA Lifelong Vitality Pack. Try this DIY supplement and experience the cellular benefits you may be in need of.*"
I myself don't buy from DoTerra, however. My own feeling and thinking is that a small amount of just about any pure essential oil is OK. But as you say, how do you know if it really is pure...