doTERRA Oregano is one of the most potent and powerful essential oils and has been used for centuries in traditional practices. The main chemical component of Oregano is carvacrol, a phenol that has powerful properties. Because of its high phenol content, care should be taken when inhaling or diffusing Oregano essential oil; only one or two drops are necessary. In addition, Oregano should be diluted in doTERRA Carrier Oil when applied to the skin. The aroma of Oregano acts as an enhancer and equalizer when blended with other essential oils.