When you use a bottle of dōTERRA essential oil, you’re using an oil that is pure. There are no contaminants, fillers, or adulterations. The essential oil industry did not have standards to ensure purity, so dōTERRA created one. Every batch of dōTERRA essential oils goes through a rigorous testing process—well beyond what would be considered “good enough.” After that, each oil is sent to an independent third party for further testing and validation.