The process of consuming or otherwise internalizing the essential oil into the body is internal use. Only pure, therapeutic grade essential oils should be used for consumption.
The FDA has approved some essential oils for internal use and assigned them GRAS (Generally Recognized As Safe for human consumption).
Here are some ways to use essential oils internally:
Capsules: Go to your local health food store and buy a big bag of capsules for cheap. This is the most common way to use essential oils internally. Place 1-10 drops of the oil inside the capsule and swallow with a glass of water. It is also common to dilute the oil with olive oil in the capsule before swallowing.
Beverage: Add to a beverage by placing 1 drop in 1-4 cups of rice milk, almond milk or water and then drinking.
Some of the oils are too strong for me to put in a drop of water and drink it. So the capsule option is better for me.
Cooking: Essential oils are very concentrated so take caution when incorporating them into your food. Sometimes 1 drop is enough and maybe less. Another way is to dip a toothpick in the oil and then stir it into the food.
Vaginal Insertion: The oils can be diluted in 2-3 teaspoons of a carrier oil and inserted using a vaginal syringe and then held in place using a tampon. Or you can dilute the oils and the tampon can be used to soak up the mixture and inserted and kept in overnight. Or add a few drops of oil to warm water then use a vaginal syringe to rinse internally.
Rectal Insertion: Recommended to aid in various respiratory conditions and internal problems. A rectal syringe may be used or the oils can be placed in capsules and inserted like a suppository.
This information was taken from Modern Essentials – A Contemporary Guide to the Therapeutic Use of Essential Oils, Pages 35-36″
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent disease.