From dōTERRA:

dōTERRA® International, LLC produces and distributes exceptionally high quality CPTG Certified Pure Therapeutic Grade® essential oils through more than a million independent distributors, also known as Wellness Advocates, around the world. In addition to a premium line of essential oils used by individuals and health-care professionals alike, the company also offers products that are naturally safe, purely effective, and infused with CPTG® essential oils, including personal care and spa products, nutritional supplements, and healthy living products.

dōTERRA CPTG Certified Pure Therapeutic Grade essential oils represent the safest and most beneficial oils available in the world today. For an oil to be CPTG Certified Pure Therapeutic Grade the oil must be:

  • Pure and natural, with aromatic compounds carefully extracted from plants
  • Free from fillers or artificial ingredients; no dilution of active qualities
  • Free of contaminants, pesticides, or chemical residues
  • Rigorously tested for standards of chemical composition
  • Cross tested using mass spectrometry and gas chromatography to ensure exact purity and composition potency
  • Sourced by a global network of leading essential oil chemists and growers to ensure correct species, growth in ideal environments, and that raw plant materials were carefully harvested at the right time