Aromatherapy is a method of alternative medicine, where the used plant essential oils induce relaxation and relief of the symptoms of an illness. Essential oils are highly concentrated aromatic extracts, extracted by cold pressure from blossoms, leaves or roots. Often these oils are dissolved in the so-called oil-bodies, such as almond oil or soybean oil, and are being applied through massage, mixed with water and used as a compress to the skin, or added to bath water or dispersed in the air for inhalation.

Essential oils should never be ingested. One drop of oil can be equivalent to 30gr (or more) of the whole plant. If taken internally, essential oils of plants such as thougia, the wormwood, the Tanacetum, hyssop, sage is toxic and can even be fatal.