Undiluted oils are too strong to use. Undiluted oils are too strong to use straight. You’ll need to dilute them, usually with vegetable oils or creams or bath gels, to a solution that only has a little bit -- 1% to 5% -- of the essential oil. Exactly how much can vary. The higher the percentage, the more likely you are to have a reaction, so it’s important to mix them correctly.
