doTERRA On Guard naturally and effectively provides immune support when used internally.* One of the bestselling essential oil blends, it protects against environmental and seasonal threats when ingested.* It can also serve as a nontoxic surface cleaner. doTERRA On Guard helps freshen the air when diffused, providing an energizing and uplifting aroma. On Guard blends Wild Orange, Clove, Cinnamon Bark, Eucalyptus and Rosemary.