6. Cassia![](https://s41998.pcdn.co/wp-content/uploads/2017/05/In-the-days-of-the-Bible-cassia-was-a-precious-commodity.jpg.optimal.jpg)
This lesser-known essential oil has notable antibacterial, antifungal and antiviral properties. This makes it a great way to cleanse the air in your living areas or bedrooms. Throw this one in the diffuser if everyone around you is starting to sniffle and sneeze.