Also known as the blue gum or Tasmanian Blue, this is the most common eucalyptus species in the world. The leaves of this Australian native are extremely rich in eucalyptol, yielding an essential oil that contains about 70% of this organic compound. Also known as 1,8-cineole and cajeputol, eucalyptol is an ingredient in cough medicines and eucalyptus oil is commonly found in muscle-warming ointments.
