Essential Oil Industry Standards: We Support GC/MS Testing

by Andrea on December 4, 2009

GC/MS TestingThe best way to assure the purity and quality of each batch of oil is with GC/MS testing. (Gas Chromatography/Mass Spectrometry.)

The precise breakdown of the chemical components in individual oils is important, because the therapeutic benefits and safety issues of essential oils are in large part determined by their chemical makeup. GC/MS testing is also used to identify any adulteration of the essential oil tested.

Samples of all oils at Aromatics International are tested. Once an essential oil is tested, the GC/MS reports are posted on the Aromatics International website–free for anyone to use and print. All the main components–and some of the trace components–are listed on these reports. Aromatics International’s GC/MS reports are kept updated, and the old reports are archived for research and review. You can see each essential oil’s GC/MS report by visiting the essential oil’s page and clicking on the GC/MS report at the top or bottom of the page.

Any reputable supplier of essential oils is dedicated to knowing exactly what they are buying and selling.

Every batch of oil I purchase from a distiller is tested with GC/MS. Testing every batch of oil with GC/MS technology assures purity and provides the exact chemistry for the specific oil tested. This information is vital for effective medicinal blending and for quality assurance.

GC/MS testing cost about $75 per oil, and tests are the responsibility of the supplier.  Distillers do not always complete these tests, and the tests are too expensive for an individual to afford.  However, for a supplier or essential oil company, this is a low cost that applies to the entire batch purchased. It is becoming industry standard for aromatherapy companies to provide these test results, and they are vital tools for true medicinal blending.

An interesting note is that the country of origin can affect the chemical makeup of an essential oil. Helichrysum is a good example. Helichrysum from Corsica has a large percentage of specific esters. These esters have a strong antispasmodic effect. Helichrysum from Croatia has almost no esters and is high in sesquiterpenes and ketones—known for healing damaged skin. Each Helichrysum is unique. We can only know exactly what’s in it with GC/MS testing. Once the analysis is completed, we can look at the report and know more clearly what the best therapeutic uses of that oil will be.

Some plants have the genetic ability to produce different chemical constituents based on the environment they grow in. This is called a “chemotype.” One example is Rosemary. Depending of the country of origin and the growing conditions, Rosemary can produce very different essential oils. The oils vary so dramatically, their primary chemical families change. This is important, as different chemotypes are used for different medicinal purposes, and have different safety concerns.

Being able to identify the specific “chemotype” of an oil is also important. This can easily be done through GC/MS.

When shopping for essential oils, always look for current GC/MS reports. Whether you’re blending medicinally or not, it’s important to know that you’re purchasing quality, unadulterated oils.  Remember that fragrance oils and synthetics can cause a myriad of problems, from headaches to allergic reactions.  If you’re not sure if the company you’re purchasing from performs full GC/MS reports, simply call or email their customer service.

GC/MS reports are not “trade secrets,” and should be easy to make available to the consumer.

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Owner/Instructor at Aromahead Institute
Aromahead Institute, owned by Andrea Butje, is a premier resource for online aromatherapy classes. Andrea offers her inspired approach to online aromatherapy certification through essential oil videos and original education materials. Check out her book, Essential Living: Aromatherapy Recipes for Health and Home, on Amazon!

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{ 10 comments… read them below or add one }

Dee March 5, 2017 at 6:05 pm

Hello, Andrea.

This is really helpful information.

I’m learning so much from you, your web site and your free introductory course. I’m hoping in the future to be able to further study with your Institute.

Learning about GC/MS testing, as well as learning about shelf-life, and other important aspects of essential oils has greatly altered the way I have been working with my oils. I also have had to choose different essential oils companies to purchase my oils from based on not being able to easily obtain the GC/MS testing.

Thank you, again.



Janet Shearsmith January 30, 2017 at 9:05 pm

Hi everyone, l am starting an aromatic website and part of my product line will be essential oils. I live in Australia and find it impossible for any company here to provide me with a GC/MS report. I have tried to arrange a meeting with customer service, sales or asked to speak to the appropriate person and all l get is we don’t provide one. (Australia is known to mix other substances in their oils) When l explained l was a nurse and studying Aromatherapy and l need to know the properties of each oil as they can vary greatly, they just reiterated, we don’t provide one. My only alternative is to purchase oils from overseas but the freight costs can be inhibiting. Any suggestions. Do you know of a reliable source of essential oils available in Australia? Appreciate any feedback you may have. Janet


Andrea Butje January 31, 2017 at 11:01 pm

Hi Janet!
In Australia, I can suggest Paperbark – and perhaps Paperbark can suggest additional resources.


Janet Shearsmith February 1, 2017 at 4:07 am

Hello Andrea, many thanks. I will check out Paperbark and tell them you are thinking of them. Much appreciated.
Have a great day, Janet


Anonymous November 15, 2010 at 2:12 am

my dad is a massage therapist and he can really relieve minor pains and injuries ,`.


Sandalwood Essential Oil October 11, 2010 at 1:07 am

That was a great post. I couldn’t agree more with your sentiments. Thanks for the effort. Great looking site by the way.


The Fragrant Muse December 8, 2009 at 3:33 pm

Have you ever had an oil tested and were so disappointed with the GC/MS results that you didn’t keep the oil?


Admin December 8, 2009 at 3:37 pm

Yes, but it was many years ago. We have an understanding with all the distillers that if we are unhappy with the test results or the aroma, we will return the oil.


Eliane Zimmermann December 6, 2009 at 11:22 am

Thank for sharing this valuable information! A. v. Keyserlingk (do you happen to import his wonderful Helichrysum oil?? 😉 once said in a lecture that the consumer (and of course the therapist) has to have to right to get the GC/MS analyses from their essential oil provider. That’s what I teach my students but they sometimes make the experience that no every provider is happy with their request… Cheers from Ireland Eliane


ilona@israel December 4, 2009 at 3:26 pm

It is really the best way to assure the purity and quality of each batch of oil to test with Gas Chromatography/Mass Spectrometry (GC/MS). When shopping for any essential oils this would be helpful..

Thanks for sharing…


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