Base oil or vegetable oil also known as Carrier Oil, is used to dilute essential oil and absolutes before they are applied to the skin in massage and aromatherapy. They are so named because they carry the essential oil onto the skin. Carrier oils do not contain a concentrated aroma, unlike essential oils, though some, such as olive, have a mild distinctive smell. The carrier oils used should be as natural and unadulterated as possible. Organic oils should be used where possible. Cold-pressing and maceration are the two main methods of prod...