Hyssop Cineol essential oil is steam distilled from the leaves and flowers of a perennial that grows in France, Spain and southern Europe. The flowers and leaves have been used since antiquity for their therapeutic properties. The name comes from the Hebrew word "ezob" (holy plant). The oil has a warm, sweet, penetrating aroma that enhances alertness and mental clarity. It is used for all respiratory conditions and has a regulatory effect on the circulation. Hyssop helps to heal the skin.