The essential oil of rosemary is steam distilled from the flowering tops and leaves of the herb. The essence is herbaceous and sweet, refreshing and stimulating. When used in massage, the penetrating actions of rosemary are beneficial. Rosemary is also a common additive to many commercial hair care preparations because it stimulates the scalp and revives dull and lifeless hair. It is reputed to be helpful with cellulite, and also helps promote concentration and alertness.