Carrier oil is made from plants (possible plant parts include nut, seed or fruit). Unlike essential oil, carrier oil is not volatile, and it is safe for the skin. Certain types of essential oil can be irritating for the skin, so they are often blended with carrier oil for safety and comfort.

The term “carrier” also refers to substance used to dilute essential oils. These commonly include cream or lotion, bath salts, water, hydrosol and aloe vera gel.