If you have fallen ill with an upper respiratory virus or the flu, it is recommended to use propolis oil, then you will be able to get back on your feet much faster. Propolis oil can also be used for preventive purposes to avoid getting sick. Most viruses and infections enter the body directly through the nasal mucosa. Propolis oil can be dripped into the nose or mouth or used for inhalation, then the path to viruses and infections will be closed.