This herb usage dates back century, belief that it could be used to cast spells that would bring, happiness, protection, or even love. Now it’s better known for it’s usage in cooking. Oregano oil can be useful in the flu season fight to stay healthy. Just a couple of drops in a diffuser can help clear your sinuses. There have been some studies showing the oils usefulness as an anti-fungal, and to fight parasites in your gut. This oil is ideal to add to your health routine.