How to Test Essential Oils for Purity

Essential oils are growing in popularity due to their pleasant scents and various household uses. However, the purity of the essential oil is important for making sure it is as effective as possible. To verify that your essential oils are high quality, it is important that you learn the signs of a good essential oil and test the oils out for yourself.

Things You Should Know

To check the purity of an essential oil, place one drop of the oil on a piece of paper and wait 30-45 minutes.
If you notice an oil or grease ring after the product dries, it could indicate an impure product.
If you need precise—results like if you're using the oil for commercial purposes—send it to a lab for professional testing.

Method 1

Method 1 of 2:

Checking Before You Buy

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Try to buy from a supplier who distills their own oils, or deals directly with a distiller who does. Suppliers should be willing to provide you with a sample (maybe for a small fee) before encouraging you to buy larger quantities. This shows that they are confident in their product and believe that if you try it you will buy.^{[1]XResearch source}
2
Do research by searching for oil by the specific name of the plant it is derived from. Being able to read the label and identify the plant makeup of the oil is the first step to buying a quality oil. The general rule of thumb is to purchase by the Latin name, which can be found by searching online for the plant, as this is normally the most specific.^{[2]XResearch source}
- For example, many customers purchase lavandula oil, also known as lavender, because of its calming effects. A common mistake is purchasing lavender oil instead, which has the opposite effect and will make the user more alert.
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3
Check the packaging for a purity statement. There should be a statement on the packaging of the oil that says “100% Pure” or something similar to this claim. If there is not, it has likely been mixed or adulterated with some other substance.^{[3]XResearch source}
- When buying oil make sure that the packaging you are buying is sealed and make ensure that the seal was not tampered with.

Method 2

Method 2 of 2:

Testing the Oils

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You can test your oil at home with just these 2 items. Make sure you cover your work surface with wax paper or tin foil to protect it from any oil that might bleed through the paper. ^{[4]XResearch source}
2
Place one drop of the oil on the paper. If your oil doesn’t have a dropper with it or a cap that allows this, you can use the eraser side of a pencil. Just dip the eraser into the bottle and let the oil drip onto the paper from there, or gently touch the eraser to the paper to get the oil to transfer.^{[5]XResearch source}
- If you’re testing multiple oils, it might help to label each one so you remember where it is on the paper.
This will normally take about 30-45 minutes depending on how much oil you have on the paper. Check after 30 minutes, and if there’s still some liquid on the paper, allow another 15 minutes to dry.^{[6]XResearch source}
4
Check the places where you dropped the oil for a leftover ring of oil or grease. If there is a ring present, that means that the oil has likely been diluted with another substance and is less pure. If you can’t see a ring, try touching the paper with your finger lightly. If it’s completely dry and you don’t feel any oil or grease on your finger, your oil is likely pure and high quality.^{[7]XResearch source}
- Some oils that are darker in color will leave a slight tint, but the paper should not be oily or greasy once completely dry. Oils such as sandalwood, patchouli, and German chamomile will leave a tint but not an oily ring.
5
Send your oils to a lab for testing if you will be using them for professional reasons. For aromatherapists and naturopaths, it might be worthwhile to send oils to a lab for chemical testing. This will ensure that the chemical makeup of the oil is indeed pure and what is labelled on the bottle.^{[8]XResearch source}
- The two means of testing are Gas Chromatography and Mass Spectrometry. These tests are often performed together in a lab, and will show whether there are any “adulterants” in the oil.^{[9]XResearch source}

Expert Q&A

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Are there any other ways to check if the essential oil is good?
Nora Oliver
Certified Life Coach & Motivational Speaker
Nora Oliver is a Certified Life Coach & Motivational Speaker based in Boston, Massachusetts. In 2021 Nora started her own coaching business, 10X Nora Oliver, where she offers corporate wellness, divorce, pre-marital, and individual coaching programs, specializing in helping others discover who they are and how they want to live their lives. She is certified in Life Coaching, Cognitive Behavioral Therapy, Health and Wellness, Nutrition, and Mindset and Forgiveness. Nora is the author of I Needed a Hero so I Became One and Mental Health Nutrition. Nora has her own local TV show which focuses on offering guidance & support to her audience on mental health. Nora was selected as Business of the Month by the Woburn Chamber of Commerce and Best Life Coach of the Year 2022. Nora has been featured in multiple media outlets such as Small Business Congress in Washington D.C., Channel 5 (WCVB), Daily Times Chronicle, Entrepreneur Modul, Fashion Show Host, Behind Bodybuilders, Disrupt Magazine, etc.
Nora Oliver
Certified Life Coach & Motivational Speaker
Expert Answer
I would start by researching the company and learning what studies they have conducted. Also, when inspecting the product, be sure to check if there's a seal on it. I would avoid it if the seal is lacking or if it's easy to open. I have seen customers buy products, fill them in with cheaper versions of essential oils, and take them back to the store as a return. And then somebody else goes in and buys them, and they are not the same product anymore.
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Warnings

Essential oils should never be ingested unless you are under the care of a trained professional.
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If you are doing home testing on your oils, make sure you’re working in a space that is well-ventilated to prevent overwhelming or unpleasant scents.
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If you’re unsure about the quality of an essential oil, hold off on buying it until you are able to verify that it is pure.
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