Pharmaceutical grade essential oils are for oral use in the treatment of disease by doctors in France, Italy Spain and Germany. They are tested in laboratories in France for their therapeutic properties. If they are not therapeutic quality, they are sent back to the producer to go into the food and cosmetics industries. Pharmaceutical grade oils are sold as a prescription item in France. For oral use they are often added to pharmaceutical grade plant extracts or tinctures. One can also put 2 or 3 drops of an essential oil or oils in a gelatin capsule. Example: Use 3 drops of oil of thyme and 3 drops of oil of eucalyptus in a capsule. Use a medicine dropper to add some olive oil to fill the capsule. The olive oil is also useful as a dispersant so that you don’t exhale the oils from the stomach.
Here are some of the essential oils that are commonly used orally or rectally in French phytoaromatherapy: