The essential oils themselves come from different parts of the plant. They are extracted usually by a method of distillation of the petals, roots, rinds, stalks, sap, nuts or bark. Sandalwood, for example, gathers in the heart of the wood of the tree, but only when the tree is 40 years old. Rose is the rarest and most expensive of all essential oils. Two tons of fresh petals in full bloom make only 2lb of essential oil.

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Since the 1980's biochemists have been identifying and isolating the ingredients of essential oils and the amazing properties they have. Unlike synthetic drugs they are not 'tailored' to treat a specific symptom, as every one of them has many properties. 

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Conventional aromatherapy, which utilizes essential oils and massage to heal the body and psyche, is increasing in popularity as may experience its effectiveness. Hospitals in France are regularly utilizing aromatherapy to speed healing and reduce the pain of patients. Organizations such as The International Federation of Aromatherapists (headquartered in London) and

The American Aromatherapy Association (Fair Oaks, California) have been established to promote this ancient practice. Specialized periodicals are now being published as well as many books on the subject.