A Vogel Po-Ho Oil (10ml). Essential oils for inhalation. Peppermint, eucalyptus and other essential oils. Mixture of purely natural, high quality, essential oils. For inhalation. Can also be rubbed onto the skin. Available in a 10ml bottle and inhaler stick. 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.