CPTG Quality Testing

CPTG Quality Testing

Every batch of dōTERRA® essential oils is subjected to strict requirements set forth in the CPTG Certified Pure Therapeutic Grade® quality protocol. This protocol ensures potency, purity, and consistency batch to batch.

 The CPTG testing begins immediately after distillation with each oil being reviewed for its chemical composition. A second round of testing is carried out at our production facility to ensure that what was distilled and tested is the same essential oil as was received. A third review of the chemistry of the oil is conducted in a three-phase procedure as the oils are packaged into the bottles we use as consumers. Each of these tests confirms that the essential oil is free of contaminants and unexpected alterations during production.

The CPTG Certified Pure Therapeutic Grade® quality protocol includes the following tests:

  • Organoleptic testing
  • Microbial testing
  • Gas chromatography
  • Mass spectrometry
  • Fourier Transform Infrared spectroscopy (FTIR)
  • Chirality testing
  • Isotopic analysis
  • Heavy metal testing


*CPTG Certified Pure Therapeutic Grade® is a registered trademark of dōTERRA Holdings, LLC and represents internal standards of quality assessment and material control. The CPTG testing protocols require the use of independent laboratories for CPTG standardization and quality testing. The CPTG protocol is not administered by government or industry regulatory agencies and does not imply regulatory approval of dōTERRA products.