Where does this blend come from?
As the bubonic plague decimated Europe in the year 1413, four thieves were captured and charged with robbing the dead and dying victims. When the thieves were tried, the magistrate offered leniency if they would reveal how they resisted contracting the infection as they performed their gruesome acts. They explained that they were perfumers and spice traders and told of a special concoction of aromatic herbs, including cloves and rosemary, that they rubbed on their hands, ears, and temples.
The proprietary Thieves oil blend was created based on research into the concoction used by the thieves of the 15th century. In 1997, studies conducted at Weber State University showed it to have a 99.96% success rate against airborne bacteria. The bacteria cultures were sprayed in an enclosed area, and Thieves oil blend was diffused for a given amount of time.