dōTERRA essential oils stand out from the rest; just one drop will convince you. Founded in 2008, doTERRA was built on a mission to share essential oils with the world. doTERRA’s founders wanted to provide the purest, highest-quality essential oils so families could be confident they were using only the best for their family’s health and well-being. This commitment led to the creation of a new therapeutic grade standard: CPTG Certified Pure Tested Grade. CPTG essential oils undergo a rigorous series of tests to detect contaminants and verify the purity of each oil. Once tested in-house, dōTERRA essential oils are sent to a third party for further testing. All of our oils meet this rigorous standard because quality is of the utmost importance to dōTERRA. If you see the CPTG label on a product, you can be assured that it is the best essential oil on the market. EACH ESSENTIAL OIL INCLUDES A FREE USE SESSION.