Aromatherapy, or essential oil therapy, is the practice of using essential oils in a variety of ways to heal the body, mind and spirit. The application of these oils, usually topically or via inhalation, promotes and harmonizes psychological, physical and spiritual health. Essential oils used in aromatherapy are typically extracted from various parts of plants and then distilled. Such parts include flower, herb and tree parts like bark, roots, peels and petals. Common essential oils used in aromatherapy are chamomile, germanium, lavender, tea tree, lemon, ginger, cedarwood, and bergamot. When inhaled, the scent molecules in the oils travel from the olfactory nerves directly to the brain, where the natural constituents can supply therapeutic benefit. When applied topically e.g. via massage or bath soak, it can help to relax tight muscles. It is thought that the oils interact with the body’s hormones and enzymes, causing changes in blood pressure, pulse and other body functions. The benefits of aromatherapy include promoting relaxation, relieving stress, treating burns, infections, depression, insomnia and high blood pressure. Typically, essential oils should be diluted before use, as direct application can result in negative effects.