The most basic form of ingesting essential oils is in culinary use.
Only ingest oils that are GRAS approved and at the time of this article only Young Living’s Vitality/Dietary essential oils are GRAS approved.
(see below for the FDA-approved list of oils that are Generally Recognized As Safe for internal use).
Lemon , you could use lemon vitality essential oil in a cake batter, but you'd only need one drop for the whole batch vs. a tsp or more of the grated peel.
Another common internal preparation is to combine it into a drink.
Do remember that oil and water do not mix, so simply adding a drop to water will leave that drop undiluted.
Just be sure to mix stevia, honey or whatever sweetner you use with your drop of essential oil before adding to the water to properly dilute and emulsify the solution.
Some oils are irritants and all oils are very strong, so it's best to be safe and dilute it.
Click on the pictures below to learn more about each Vitality essential oil, the suggested usage, prices and for purchasing.
Measurement
Conversion
2 Drops = 1/2 tsp.
4 Drops = 1 tsp.
8 Drops = 1 tbsp.