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You are here: Home / Health Concerns / Are Old Essential Oils Dangerous? Use Them or Toss Them?

Are Old Essential Oils Dangerous? Use Them or Toss Them?

by Adrienne 45 Comments Updated: December 19, 2018

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What is the shelf life of essential oils?

Do essential oils expire?

These are important questions to answer.

What is the shelf life of essential oils? Do essential oils expire?

Essential oils are not cheap.  Well, some of them are very affordable, but some are quite expensive, and of course the bottles are quite small.

If you are into DIYing essential oils blends instead of buying blends pre-made, knowing about essential oils expiration and the shelf life of essential oils can be a big deal.

For example, let's say you want to save money by making your own essential oils blends like my Breathe Easy Blend, Hair Growth Blend, or Antibacterial Blend.  However, if you end up having a bunch of left over essential oils that you end up tossing because they expired, then you end up not saving any money at all.

Sigh.

Anyhow, the topic of the shelf life of essential oils and whether or not essential oils expire is something that I have been wondering about for a long time.

Because I'm a money-saving-bulk-buying kind of gal.

I'm the gal who buys 25-pound bags of organic dried beans, 25-pound bags of organic coconut for my Homemade Coconut Chips and Easiest Coconut Milk, 25-pounds of chicory for my Nourishing Coffee Substitute — and yes, I have bought a lot of single essential oils to make blends from.

And I have a lot.

So for all of the other money-saving-bulk-buying folk out there, here are the facts on the shelf life of essential oils.

One Myth About Essential Oil Expiration

There are lots of myths running around regarding essential oils and one of them is this:

“If a company tells you that their essential oils expire, or have a shelf life, then they are not pure essential oils.”

That's not true.

Now, it is true that essential oils do not contain water, so they do not grow mold, mildew, or yeast, and additionally they have antibacterial and antiviral properties, but they do change over time and you need to know how in order to be able to use your essential oils safely and effectively.

Several things can affect the shelf life of essential oils and can cause them to not be as effective.

Essential Oils are volatile oils (they easily evaporate — that is why you smell them) and they can oxidize.  If you know anything about the word “oxidize,” it means that it is affected by oxygen.

You've surely heard about “antioxidants” in foods and how they are good for you, right?  They prevent, or help get rid of, the damage done by oxygen exposure that is called “oxidizing.”

In the same way that oxidizing affects foods (and your body), oxygen affects essential oils.

What is the shelf life of essential oils? Do essential oils expire? Essential Oil Shelf Life

Things That Affect the Shelf Life of Essential Oils

Oxygen

Every time you open your essential oil bottle oxygen gets in.  The oxygen reacts with the oil and oxidizes it, in the same way that exposure to the air causes an apple to turn brown.

According to Robert Tisserand's Book On Essential Oil Safety,

“oxygen can change the chemical composition of an essential oil by reacting with some of the constituents.”

Think about that. If you are changing the chemical composition of an essential oil, then you basically have a different essential oil than you thought you had.

The properties that you bought it for might not be in the essential oil any longer and there will be new properties — some of which might not be desirable.

Light

There is varying information on this, however it is known that light is also something that affects essential oil shelf life.  That is the main reason why it is recommended to store your essential oils in colored bottles, which apparently help to minimize this effect.

A study was done on Sweet Orange Oil in which the oil underwent significant changes in its composition when it was exposed to UV light at 20°C for 50 minutes. There were decreases in certain constituents and new constituents resulted. So technically the oil was a totally different oil after this exposure. (Source)

Fennel Oil has been shown to oxidize more quickly in light than in dark. (Source)

Heat

Heat also can affect essential oil shelf life, however this has not been as widely studied.

Robert Tisserand, considered by many to be the foremost expert on essential oil safety, recommends keeping your essential oils away from heat and in cool areas, ideally in the refrigerator. (Source)

Heat would cause the volatile compounds to evaporate more quickly, but of course the lid of the bottle would need to be removed in order for this to happen.

It appears, from the studies that have been done, that the effect of heat on an essential oil will vary depending on the components of that specific oil with components such as citral, citronellal, and oils that are high in monoterpenes seeming to be more greatly affected by heat exposure.

Apparently, those essential oils that are extracted using CO2 are more prone to damage from heat than other essential oils, though the reason for that is not yet known. (Source)

Time

One more thing that can affect essential oil shelf life is time. Of course, if the essential oil is not exposed to oxygen, light, or heat (so it's unopened in a dark, cool place), then it should be fine.  However, once you open the bottle, the deterioration begins and it is progressive with time.  As you expose the essential oil to any of the above assaults, over time, the essential oil will change.  If you regularly open your bottle to use the oils, then the effect will occur more quickly.  Additionally, as you have less of a particular essential oil left in a bottle, it will be exposed to more oxygen and the effect on the remaining oil will be greater.

There are some essential oils that get better with time, Patchouli being one of them.  Others that I have read about include Sandalwood, Rose, possibly Cedarwood, Vetiver, Frankincense (CO2), and Myrrh.

Are Old Essential Oils Dangerous?

Essential oils are made up of different components.  There are lighter components and heavier ones.

The lighter components are the ones that evaporate first and so that would leave behind the heavier components.  Typically, the lighter components are the ones that are gentler on the skin.  So if you use an essential oil that has been around for awhile, your chances to experience irritation are greater.

Additionally, the chances of getting sensitized to the oil increase as well. As I mentioned in this post on Emulsifying Essential Oils, you can greatly minimize the chances of sensitization in general.

And as I mentioned above, when essential oils are exposed to light, heat, and oxygen, the components change.  So what you end up with is a different oil than what you started out with.

So yes, old essential oils can be dangerous.

What is the Shelf Life of Essential Oils?

I'll write in more detail about this in the future, but for now, here are the basics about essential oil shelf life.

Essential oils that have a higher quantity of monoterpenes or oxides have the shortest shelf life — approximately 1-2 years.

Those essential oils that have a higher quantity of phenols may last up to 3 years.

Essential oils that contain ketones, monoterpenols, and/or esters have a shelf life of approximately 4-5 years.

Essential oils with a higher amount of sesquiterpenes and sesquiterpenols can last up to 6 years.

Don't worry if all of this “terpene” and “ketone” and “….perpenol” stuff is confusing.  We'll go over it more later :).

In the meantime…. I have a few ideas about how you can safely use essential oils for a more natural approach to beauty, home care, and healing.

“The” Essential Oil Safety Book

I referenced this book several times in this post, and there's a reason for that.  It's a good one.

Robert Tisserand's book is considered by many to be the book on Essential Oil Safety and he has fabulous information about essential oil shelf life as well.

It's a fabulous reference tool for anyone wanting to know more about essential oils in general, and essential oil safety in specific.

Essential Oil Safety: A Guide for Health Care Professionals

Conclusion

Essential Oils are pretty stable, but you need to take care how to store them.

Use common sense.  If an oil smells bad or looks bad, don't use it.

Better safe than sorry.

Of course, you need to be careful to buy pure oils in the first place.  Personally, I buy oils from several different sources.

Years ago, I started looking for a quality essential oils company that I could trust.  After hours and hours of work, I ended up choosing the essential oils company mentioned in this post and have added Neal's Yard Remedies to the mix. I initially chose them for their skincare and personal care, but they have an amazing line of oils that are all produced sustainably.

A number of you have asked about organic essential oils – I am talking to other companies as well so that I can have more sources for my family and for all of you as well.  Please stay tuned for that information.

Got a question about Essential Oil Storage or the Shelf Life of Essential Oils? —
Leave it below!

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Filed Under: Essential Oils, Health Concerns

About Adrienne

Adrienne Urban is the Founder and Owner of Whole New Mom. She has a background in research, journalism, insurance, employee benefits, financial markets, frugal living, and nutrition. Seeking a better life for herself and her family, she uses research and consults with many physicians and other practitioners to find solutions to the variety of issues they have dealt with including life-threatening food allergies and thyroid and adrenal concerns. WholeNewMom.com is the result of her experiences and knowledge gained throughout the process. Posts are reviewed and verified by the Whole New Mom team.

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  1. Phyllis says

    May 23, 2018 at 6:38 pm

    Okay, so I have many (many) bottles of essential oils some of which I haven’t opened in years…more than7….(yes they were opened once but then I moved and haven’t touched them) and they are away from heat and light. The ones I do use are mostly put in the air…for purification or scent. Before I read your article I was considering using my “edible” oils…adding them to my water and food. Now I’m wondering if that is a bad idea!?

    Reply
    • Adrienne says

      May 25, 2018 at 2:18 pm

      I personally wouldn’t want to ingest something that old. You might want to look up each oil and how it changes w/ age and then decide.

      Reply
  2. Donna says

    March 10, 2018 at 4:00 pm

    Are essential oils mixed with water safe for reuse?

    Reply
    • Adrienne says

      March 11, 2018 at 8:53 am

      Hi Donna. I think that depends. What kind of mixture are you talking about? What concentration? I’m not an expert, but once you introduce water bacteria is encouraged to grow. You would need a high concentration of essential oils to keep the bacteria at bay and even then it would only be safe for certain uses for a certain amount of time. So it depends on a lot of things.

      Reply
      • Michele says

        March 19, 2018 at 11:14 pm

        I think it is preferable to mix the water in a 1:1 ratio with some type of alcohol (not rubbing alcohol as it has acetone in it) or witch hazel or even vinegar if those are not available (though not preferable as vinegar has a strong scent of its own) — and then add the oils.

        For instance 1 part distilled or filtered water to 1 part vodka or perfumer’s alcohol or vinegar, and then adding 30 drops essential oils of whatever blend you are using. This will last a very long time.

        Reply
        • Michele says

          March 19, 2018 at 11:15 pm

          I forgot to mention in this case I was talking about 1/2 c. water and 1/2 c. alcohol or witch hazel.

          Reply
  3. Sbonga says

    February 20, 2018 at 12:32 pm

    Good day

    jojoba oi
    rose hip seed oil
    grapefruit oil
    juniper oil
    lemon oil
    vitamin 5

    Please advise on the shelf life of this combination

    Thank you

    Reply
    • Adrienne says

      February 20, 2018 at 1:17 pm

      Hi there. Sorry but it’s dependent on proportions. I am not an expert on this topic and am unable to help.

      Reply
  4. Lidya says

    December 30, 2017 at 7:36 pm

    I recently came across a shop that produces homemade and natural skin care. I’m interested to try their natural face oil one of them is Sandalwood, Turmeric and Licorice infused with Coconut Oil, Olive Oil, Almond Oil, Grapesees Oil and Vit E Oil and it contains a lot about 60ml.

    My questions are, do you think it has long self life? I’m just afraid that it would expire before i use them all.
    Does it fit for dry/acne prone skin? Cause they have another variant for oily/acne/sensitive skin which is Neem, Cinnamon and Lemon Peel infused with Coconut Oil, Grapeseed Oil, Tea Tree Oil and Vit E Oil.
    I have dry skin but prone to acne.
    Also, they put a how to apply and it says i need to wash it after let it set for 30 minutes, do i really have to?

    Sorry if i ask a lot of questions, i’m just starting to change my skin care products to natural and organic so I’m not very well informed about it yet.

    Hope you can answer, thank you!

    Reply
    • Adrienne says

      January 20, 2018 at 9:58 pm

      Oh my goodness. I’m sorry but I don’t know. I think that the vitamin E and EOs would extend the shelf life but you should ask them these questions since they are making them. If it doesn’t work for you I am happy to help you find something that will.

      Reply
  5. Lidya says

    December 30, 2017 at 5:56 am

    I recently came across a shop that produces homemade and natural skin care. I’m interested to try their natural face oil. One of them is Sandalwood, Turmeric and Licorice infused with Coconut Oil, Olive Oil, Almond Oil, Grapeseed Oil and Vit E Oil. Do you think it has a long shelf life? Cause it contains a lot about 60ml i’m just afraid it expires before i use all of them. Also, do you think it’ll work on dry/acne prone skin?

    They also have another variant for oily/acne/sensitive skin which is Neem, Cinnamon and Lemon Peel infused with Coconut Oil, Grapeseed Oil, Tea Tree Oil and Vit E Oil.

    Thank you so much, i hope you can give me an answer!

    Reply
    • Adrienne says

      February 18, 2018 at 7:52 pm

      Hi there. Sorry but I don’t know.

      Reply
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