Rosemary (Rosmarinus officinalis) is an important essential oil for any beginning aromatherapy kit. It is useful in many applications and well known for its strong, fresh, resinous and herbal aroma. It has a soft, less intense camphorous-like aroma than other rosemary varieties. The main constituents in rosemary include cineole, camphor and camphene, which give the oil its herbaceous, eucalyptus-like aroma. Pinene and small amounts of bornyl acetate, borneol and linalool produce the foresty, sweet undertone of the oil. Rosemary combines well with many other essential oils, including peppermint, eucalyptus, lavender, spice oils, citrus oils and clary sage. Rosemarys invigorating aroma supports mental alertness and clarity, and has a long association with scent-memory response. It is often used in diffusions, vaporizers and humidifiers, as well as for body care, massage, bath, hair and scalp applications.