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Essential oils can be used in aromatherapy, a kind of complementary medicine that uses smell to improve your health or applied topically to the skin.

Studies have shown that essential oils may help:

• Boost mood
• Improve job performance through reduced stress and increased attentiveness
• Improve sleep
• Kill bacteria, funguses and viruses
• Reduce anxiety and pain
• Reduce inflammation
• Reduce nausea
• Relieve headaches

doTERRA uses its own internal facilities alongside independent third-party labs to test its essential oils through a proprietary process called CPTG Certified Pure Tested Grade. 

[1]How the Testing Works

• CPTG Standard: doTERRA created and trademarked this internal term rather than using an official government or independent regulatory agency. [1]
• Eight Test Methods: Each batch undergoes microbial testing, heavy metal testing, organoleptic testing (sensory evaluation), gas chromatography, mass spectrometry, Fourier-transform infrared spectroscopy (FTIR), chirality testing, and isotopic analysis. [1]
• Quality ID Tracking: Customers can look up the GC/MS (Gas Chromatography-Mass Spectrometry) test results for individual single oils by entering the code printed on the bottom of their bottle at the Source To You Quality Report page. Proprietary blends are not included in these specific batch lookups. [1]

Aromatherapy works primarily by stimulating the Cleveland Clinic olfactory system and through direct absorption of plant compounds into the skin. [1]The Inhalation Pathway (The Brain and Nervous System)

• Releasing Molecules: Essential oils release tiny volatile molecules into the air when vaporized, heated, or opened. [1, 2]
• Triggering Receptors: When you breathe in, these molecules enter your nose and bind to specialized olfactory receptor cells. [1, 2]
• Activating the Limbic System: The receptors send electrical messages straight along the olfactory nerve to the brain's limbic system—the emotional and memory center containing the amygdala and hippocampus. [1, 2]
• Releasing Chemicals: This brain activation triggers a response that can release neurochemicals like serotonin, dopamine, or endorphins, influencing mood, heart rate, and stress levels. [1, 2]

The Topical Pathway (Skin Absorption)

• Absorbing Compounds: When diluted with a carrier oil (like jojoba or coconut oil) and rubbed onto the skin, plant compounds and tiny terpenes are absorbed through the dermal layers. [1, 2]
• Local and Systemic Effects: These chemical components can enter local tissues to soothe muscles or pass in small amounts into the bloodstream for broader physical impact