Essential oils are concentrated, highly potent substances. A working knowledge of how to use them safely is vital and should be respected. Knowing how to dilute essential oils properly will help you to use them safely and gain the highest possible therapeutic effects. Essential oil dilution is a safety precaution for two reasons: The most effective way to dilute essential oils is in a carrier oil. A carrier can be any high-quality vegetable oil, such as almond, grapeseed, apricot kernel, jojoba, olive or sesame. Percentage dilution is worked out on the basis that there are 20 drops of essential oils in 1ml. Aromatherapy for home use usually adapts the.