This is a common question asked because there are some essential oil companies who are touting their oils as “food grade” and they insist that if the essential oils offered by another company are not listed as “food grade” then they aren’t “therapeutic grade.”
“Therapeutic grade” oil means the same thing as 100% pure, 100% therapeutic, or any combination of those terms. It just means the oils are pure of contaminants, pesticides, synthetics, and other adulterants, and can be used therapeutically. Any pure essential oil is therapeutic grade. Most of them can be ingested, and all of them are therapeutic.
“Food grade” oil, however, refers to any oil that can be used in food. So that also applies to cooking oils like Olive, Canola, Vegetable, macerated oils, linseed oil, as well as some mineral and motor oils. Most essential oils CAN be used in food but because the definition of food grade oil is so loose and open, I would really hesitate to use it for essential oils because the implication is that all the other food grade oils are as good as essential oils, which is just not so.
The important thing is are the essential oils pure? Are they free of contaminants, fillers, synthetics, pesticides, and other adulterants? Then it doesn’t matter if they are called 100% pure, 100% therapeutic, 100% pure therapeutic, or other forms.