The only feedback I have ever gotten was using peppermint oil.
One person said,
Wonderful I had so much energy after working all week - I never do!
Another person said....Pls don't ever use that again I couldn't sleep. LOL
Oh, right...then a guy said,
WHAT did you use on me I was beating the girls off me at a club.
Rosewood.
Otherwise all the oils just smell goooood. I have no reactions.
Now Flower Essences are a whole other story!! Mind blowing powers.