Po-Ho Inhalation Oil - Peppermint, eucalyptus and other essential oils Essential oils have become extremely popular and are used in many different ways. The key feature of essential oils is that they evaporate at room temperature - this is the reason they smell so pleasant. Apart from imparting a pleasant, relaxing aroma, essential oils can also help the body in other ways, forming the basis for aromatherapy as a healthcare discipline. In addition, the essential oils of Peppermint and Eucalyptus have been used traditionally to help maintain clear, cool breathing. Alfred Vogel first wrote about Po-Ho essential oil in March 1929 in his first magazine, Das Neue Leben (A Fresh Start). The name comes from Po-Ho, the (Mandarin) Chinese for peppermint, one of the five essential oils in this refreshing classic.