If you have never heard of Four Thieves oil, you need to look this up. The story goes like this; in the Fifteenth Century, Some thieves came up with this recipe and used it to protect themselves from getting sick while digging up graves. They gave the recipe away in order to make their sentence lighter when they got caught, and we have it today.
Four Thieves oil is made up of cinnamon oil, lemon oil, rosemary oil, clove oil, eucalyptus oil, and lemon oil. When combined in the right proportions, this mixture is amazingly beneficial. It helps serve as an antiseptic, and has anti-viral properties as well. It is good to use if someone in the family is sick or has a cold.
Here is more information on it: http://mountainroseblog.com/thieves-oil/
I think I just might want to make some!