Essential Oil Extraction Methods

This is a partial excerpt of the UEOS Basics course (taken from Module 1, Lesson 3). For more information, visit

Essential oils are highly concentrated components extracted from plant matter (flowers, fruit, leaves, resin, twigs, seeds, roots, etc.) in one of the following ways:

Steam Distillation

The most common method is steam distillation. This involves steaming the plant matter of choice for a determined amount of time, under a specific pressure, and at a certain temperature – so as to release the oil. The collected oil is officially an “essential oil.”

CO2 Extraction

Similar to steam distillation, only liquid CO2 is used instead of water. After the liquid CO2 and the plant matter combine, the CO2 is turned back into a gas, leaving the plant matter and essential oil behind. This provides a different, arguably more pleasant aroma than you typically get from steam distillation, although shelf life may be shortened.


This method involves mashing citrus rinds in water. The oil released is separated from the pulpy water and collected as an essential oil. Because pesticides are sprayed right onto the rinds, it's important to seek organic options for cold pressed essential oils.

Solvent Extraction

Typically labeled as “absolutes,” the plant material, usually flowers, are mixed with a solvent. Traditionally, aromatherapists have generally avoided absolutes (which are  not true essential oils) due to the amount of solvent left in the final product, but modern ways of making absolutes have allowed for only trace amounts to remain. Aroma is typically less pleasant, and the quality lesser, compared to other extraction methods.

It is important to note that all essential oils are considered “pure” after extraction, regardless of the quality of the plant matter used.

Extraction methods are listed for each of the 60 essential oils profiled in my book, Essential Oil Profiles: Aromatherapy Reference Manual for the Everyday Beginner and Beyond.

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Lea Jacobson is a Certified Clinical Aromatherapist Scholar's Program graduate from Aromahead Institute. This website is home to educational advice and empowering information about using essential oils safely. The Using Essential Oils Safely facebook group founded and run by Lea and her team has over 140,000 members and hundreds of new members joining each week. Lea is the author of her bestseller Essential Oil Profiles (available as a full color print book as well as an ebook). Based off the information in the popular Top 60 Essential Oils APP, the print version has sold out in days each time it's been offered. Other books by Lea: The TRUTH About Essential Oil Safety, and the Hydrosols Quick Start Guide.

Lea is the creator of Safe Essential Oil Labels, designed to wrap around any size or brand bottle, as well as apps for essential oils and carriers, and hydrosols.

You can find FREE classes here: Free Essential Oil Classes, and sign up for the Using Essential Oils Safely BASICS course Lea teaches where you can earn your "Essential Oil Safety Advocate" title.

Lea is Professional level member of the Alliance of International Aromatherapists and received her herbalist certification through The Herbal Academy of New England.

Businesses, groups, and individuals can hire Lea to consult on safety, product formulation, and more on her website Lea Jacobson CCA.



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