CPTG Certified Pure Therapeutic Grade is the technical term for the quality of doTERRA essential oils. It sounds official and impressive. And it is. Until doTERRA established the Certified Pure and Therapeutic Grade benchmark, there was not an industry-wide accepted standard for essential oil quality. CPTG certifies there are no added fillers, synthetic ingredients, or contaminants in an essential oil that can reduce their efficacy. CPTG is the most stringent standard in the essential oil or aromatherapy industries.
To receive the CPTG seal, doTERRA puts every shipment of essential oil through a battery of tests at their own facilities, as well as trusted third-party labs. Each batch of doTERRA essential oils goes through an extensive CPTG process before it is made available for sale to ensure that the product is the highest quality, every time.
Step 1: CPTG Chemistry
Chemistry is the foundation of pure, quality essential oils. To ensure each batch of essential oil is pure, it goes through “Gas Chromatography/Mass Spectroscopy” (GC/MS) testing. After the aromatic compounds are distilled from the plant material, GC/MS testing guarantees that the chemistry of the oil matches an expected profile or standard for that oil.
First, the gas chromatography instrument separates the oil molecules based on its chemistry. The mass spectrometer identifies each group of molecules. An analysis of the ratios between each chemical constituent of the oil allows doTERRA to verify the oil is in its most pure, natural form.
Once the batch of essential oil is determined to meet stringent chemical profile guidelines, it can move on to the next testing stage.
Step 2: CPTG: Physical Testing
Following chemical testing, each batch of essential oil goes through five different physical tests:
- Organoleptic assessments. For essential oils, organoleptics are the attributes that can be tested through sight and smell. Essential oil chemists, manufacturing engineers, and quality technicians manually assess the appearance, aroma, and color of each batch of essential oil.
- Fourier Transform Infra-Red Spectroscopy (FTIR). FTIR testing analyzes the material composition of the oil using infra-red light.
- Optical rotation. A test for chirality (a molecule not superimposable on its mirror image) to twist molecules to identify any synthetic additives that GC/MS testing would not detect.
- Specific gravity. A comparison of the volume-to-weight ratio to reference standards to verify oil quality and purity.
- Refractive index. A refractometer determines if the essential oils refractive index (a measure of how light propagates through a specific substance) meets doTERRA’s established standards.
Step 3: CPTG: Contamination Testing
Following physical testing, the oil undergoes a series of contamination tests to confirm that there are no harmful contaminants in the batch. Testing looks for potentially harmful microorganisms, heavy metals, and pesticides to certify the oil is safe when proper usage guidelines are followed.
The final step in the CPTG quality testing process ensures the essential oil will remain pure for the entire shelf life of the product.
Step 4: CPTG: On-Going Stability Testing
Stability testing is an ongoing process that involves not only the integrity of the essential oil itself but the packaging as well. The testing utilizes chambers that alter the temperature and humidity to analyze what happens to an essential oil when it is exposed to different atmospheric conditions. This testing ensures that doTERRA CPTG essential oils will maintain their purity and efficacy to provide safe and effective benefits years after being processed.
Without an official controlling body, doTERRA has developed an industry-first testing protocol to verify the contents of every bottle matches the purity and quality claims on the label. CPTG essential oils ensure every doTERRA bottle and every essential oil product is safe and effective, and will be throughout its shelf-life.