[Everything doTERRA] question about testing

My daughter is a college student and is a bit cynical about essential
oils.
She just sent me a question that I would love to have answered and
knew this was the place to ask!!

"I was just studying for my child psych class and a question popped
into my head. have there been any double- or single-blind studies
done with the oils?"

Anyone??

Thanks

Mary Beth

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