Yes, many companies do GC/MS testing and infrared. The real test is, what do they compare the results to and what is that company’s standard for what a good oil is? If their standard is high, then they may reject oils which are below that standard. If their standard is not so high, then they will accept and sell more oils, even ones that have been rejected by a company with higher standards.
Ok I don’t usually make comments on articles but I just had to on this one. To the author: I’m sorry but this blog is poorly researched and full of errors. If you are going to put out information that people take as truth or at the very least as suggestions because they like you, you need to know what you are talking about. I highly suggest you take this blog down, re research essential oils and rewrite one that is accurate.
Don’t overdo it though. Remember, these oils are extremely concentrated. Prolonged exposure to essential oils can cause ill effects like headaches, nausea or other unpleasant symptoms. Vary your use with different oils of different chemical compounds so that they don’t build up in your system. And avoid letting your diffuser run all day, every day; there is a such thing as too much of a good thing.
Finally we performed a common and simple test for purity. Since essential oils are not truly oils they respond differently when they come into contact with blotting paper. When pure essential oils are dropped onto a piece of blotting paper they will impregnate the paper and then evaporate leaving no obvious trace. However, if you place a drop of diluted essential oil on blotting paper, the vegetable oil used to stretch the original will leave an oily stain on the paper.
There is also an argument from YL distributors that their oils come from the best crops in the world. As they grow their own crops and only use their own, not sure how they can claim it’s unarguably the best in the world. Every crop is different. Only sampling every crop, every batch would support that claim. Anyway, I am not a qualified aromatherapist either but my research suggests that YL oils and their advice might be best to avoid.

For each profiled oil, you will find information on its botanical name, common method of extraction, oil color, oil consistency, perfumery note, strength of the initial aroma, aromatic description, uses, constituents, and safety information. For most information provided, the data is based on the review of particular samples and could differ from your personal experience. As the uses, constituents and safety information data are subjects requiring research, specific references are provided.


Distillation process: A gentle, proprietary, steam extraction technique for distilling. Also cold pressing and resin tapping methods for select oils. Low-heat steam distillation process and compression. Plant Therapy works with third-party distillers that can continuously guarantee quality and purity. Steam distillation. They are steam distilled/ cold pressed without any adulteration or synthetic additives.
What I found most impressive is that they control their product right from the very botanical seeds; cultivating, harvesting and distilling many of their essential oils right on their very own farms across the world. This gives Young Living the unique ability to verify their quality standards at every step of the process. For more information on this, check out their proprietary Seed to Seal production process.
Organic essential oils are not only good for sustainable agricultural practices, they also have the greatest healing properties, says Josh Axe, D.N.M, C.N.S., D.C. founder of DrAxe.com, best-selling author of Eat Dirt, and co-founder of Ancient Nutrition. “Having nothing else added in during the extraction process is the only way to guarantee they are unprocessed and sourced directly from the plant,” says Dr. Axe. Organic is definitely more expensive than conventionally grown, but you’re also getting a superior essential oil.

Do not take any oils internally and do not apply undiluted essential oils, absolutes, CO2s or other concentrated essences onto the skin without advanced essential oil knowledge or consultation from a qualified aromatherapy practitioner. If you are pregnant, epileptic, have liver damage, have cancer, or have any other medical problem, use oils only under the proper guidance of a qualified aromatherapy practitioner. Use extreme caution when using oils with children. It is safest to consult a qualified aromatherapy practitioner before using oils with children. For in-depth information on oil safety issues, read Essential Oil Safety by Robert Tisserand and Rodney Young. 
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