I used to make a Hand & Foot Salve (think of that Burt's stuff in the metal tin only without the beeswax) that had EO's in it and I won't lie, now and then I used it on my lips and so far, I'm not dead. But this was one of those 'just for me' kinds of items so I didn't worry too much about EO properties, even less because its primary use was hands, feet, elbows, ya know, those parts that get REALLY dry. Anyway, this probably isn't the most helpful post but I know it can be done. The only problem I ran into when doing it was well frankly, the taste wasn't spectacular. It smelled great, it tasted vaguely medicine-like.