1. There is no such official term as “therapeutic grade” essential oils.
There are no grades of oils in aromatherapy.
All essential oils or absolutes are distilled/extracted in the exactly the same way and are naturally therapeutic.
Who sells “therapeutic grade” oils?
someone with very little knowledge of essential oils
companies using a marketing term to falsely state that their oils are superior
Either way - beware of buying from anyone who uses this terminology as they may even sell adulterated or synthetic oils