Oregano is considered by many to be "nature's cure," and is commonly used in many things. Our oregano oil has a high carvacrol content, and is steam distilled from the leaves of the Origanum vulgare plant grown in Spain. Oregano is incredibly potent. Topically, it can cause sensitivity and should only be used in extremely low dilutions. It should also be mixed with other oils before diffusing, as it is extremely potent. Mix with a blend before diffusing, mix into a blend for topical application, or apply in max 2% dilution.