Are Lavender and Tea Tree Essential Oils Safe To Use If You Have Breast Cancer?

Image Source: / Feelart
Image Source: / Feelart

Are Lavender and Tea Tree Essential Oils Safe To Use If You Have Breast Cancer?

Probably at least once a week, a woman with breast cancer asks me whether lavender and tea tree essential oils have estrogenic properties, and whether they are safe for her to use. Being a breast cancer coach – and especially someone who recommends the use of essential oils – it’s a fair question. With this article, I hope to give you some things to consider when using essential oils, some of the research, and to share with you why quality matters when considering essential oils as part of your healing regimen.

The reason people are asking this question is because of a small study [1] that indicated lavender and tea tree oil may have estrogenic or hormone disrupting properties.

This is my response and my position on this matter.

The study listed at [1] below in References reported that lavender oil and tea tree oil could possess endocrine disrupting activity. It was a very small study comprising exactly three young male patients who presented with idiopathic (of unknown origin) pre-pubertal gynecomastia. Gynecomastia means enlarged breast tissue. It is purported to be the result of disrupted estrogen and androgen signaling, leading to increased or unopposed estrogen action on breast tissue. All three boys had extensively, and over a long period of time, used products containing either lavender oil or a combination of lavender and tea tree oil. Two of the boys were exposed to a cologne named agua de violetas, and lavender oil was just one of the ingredients.

The vast majority of breast cancer diagnoses are estrogen receptor positive (ER+), so based on this single study, women with ER+ breast cancer are being warned off lavender and tea tree oils. Since this study [1] was published, it has been cited hundreds of times, according to Google Scholar, and reference has been made to the supposed estrogenic or endocrine disrupting activity of lavender and/or tea tree oils. That’s rather akin to hanging someone without a proper trial, I say.

Let’s be sensible here. Things to consider:

1. What other ingredients were in the agua de violetas? Fragrance ingredients are NOT evaluated for safety, in fact most fragrance manufacturers keep their ingredients a closely-guarded secret. It is one of the least regulated industries in the world. Some chemical fragrances are known to be endocrine disrupters, why just blame the lavender? Since no compositional data on the essential oils was supplied in the original paper [1], the presence or absence of xenoestrogenic contaminants such as pesticides, herbicides, etc – known endocrine disrupters – is not known. To draw conclusions about the estrogenic activity of these essential oils without all of the relevant data is just crazy. It is quite possible that these three boys had gynecomastia for other reasons. Tea tree and lavender oils have been blamed, but have not been definitively identified as endocrine disrupting compounds. Indeed, both tea tree and lavender oils have a long history of safe use.

2. Lavender essential oil, if properly distilled from true lavender, Lavandula angustifolia (and NOT lavandin, as many are) is a beautiful oil and has been used for centuries for all sorts of illnesses, skin complaints, for stress, as a sleep promoter, and it has many anti-cancer properties (and yes, there is research to back that up). The study at [1] did not take into account what kind of lavender had been used. Was the lavender improperly distilled using chemical agents that are themselves known to be endocrine disrupters? The composition of the essential oils tested was not given, nor was there any other information about them, other than the supplier. Were the oils organically grown? If not, contamination with herbicides and insecticides is a definite possibility, also known for hormone disruption.

3. What other research has been done since 2007? A study released in March 2013 looked into the subject of the supposed estrogenic activity of lavender essential oil [2]. In this study on rats, lavender oil at dosages of 20 and 100 mg per kg was found to show no sign of being estrogenic in a uterotrophic assay, the gold standard in vivo (meaning in the body) research. Unfortunately, the animals were only tested for 3 days which was probably an insufficient length of time to be considered a thorough examination, but the study is still interesting. Particularly since the concentrations used with the rats amounted to more than 6,000 and 30,000 times greater than normal or average human exposure from a multitude of cosmetic products containing lavender oil.

4. Robert Tisserand, one of the world’s leading aromatherapy experts, an author, educator and all-around essential oil guru, states this about the subject of lavender oil and estrogen on his website: “One in vitro study found that lavender oil had a very weak estrogenic action in MCF-7 breast cancer cells (Henley et al 2007). However, there is no evidence that lavender oil has any adverse effects on human hormonal activity. In another in vitro study, lavender oil inhibited the growth of MCF-7 cells (Zu et al 2010) suggesting that, while it may bind to estrogen receptor sites in the body, it is not an estrogen mimic, and so does not promote estrogen.” [3]

5. There is an incredibly high incidence of adulteration of essential oils. One 2014 study on tea tree oil [4] found that more than half of the 43 samples tested failed to comply with the proposed ratios. In oils sourced from China, the incidence of adulteration is closer to 100%. Compounds not normally found in pure tea tree oil were detected in this study and that’s not a good thing. This brings me to the next subject.

Quality Matters

If I’ve said this once, I’ve said it a thousand times – know where your essential oils come from. Know how the plants are grown. Does the company grow the plants using organic principles? Find out how the essential oils are distilled. If your supplier can’t or won’t tell you this, steer clear of them. Make sure your essential oil supplier uses only Lavandula angustifolia for their lavender oil – and not lavandin, a cheap and less effective substitute. Make sure that the product you are buying contains only the oil of the plant and not a bunch of toxic chemicals like phthalates, or parabens, which are known to have endocrine disrupting properties. Generally speaking, the cheaper the oil, the less you want to consider it.  If you need my help sourcing excellent essential oils, let me know.


1. Prepubertal gynecomastia linked to lavender and tea tree oils – February 2007 –

2. Uterotrophic assay of percutaneous lavender oil in immature female rats – March 2013 –

3. Activities of ten essential oils towards Propionibacterium acnes and PC-3, A-549 and MCF-7 cancer cells –

4. Enantiomeric distribution of selected terpenes for authenticity assessment of Australian Melaleuca alternifolia oil –

Lavender oil is not estrogenic

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13 thoughts on “Are Lavender and Tea Tree Essential Oils Safe To Use If You Have Breast Cancer?

  1. Thank you for this info. I love Lavender and was crushed when I read ER+ should not use. I’m new to EO, doing diligent research to use any cancer fighting EO I can to support good health

    1. Hi Kim,
      Sorry for the long delay in responding. Yes, that information about lavender is all wrong. Have you seen my page where I list the best essential oils to use? Here it is: The more research I read, the more I begin to understand that nearly every single essential oil has *some* anti-cancer properties. They all seem to work in different ways, it’s truly amazing. I hope you continue to enjoy using them and in good health!
      Warmest regards,

  2. When you have cancer in general it is very difficult to do all the reachers, what oil product you can buy and contain no chemicals! You can’t really think straight! There are to many things suddenly going on in your life, as a cancer patient! 22 years ago when i had breast cancer, i refused chemo etc. and just followed as last recourse my inner voice, who guided me through Holistic & Natural therapies! I used many different essential oils!
    Lucky me with all the guided treatments, i was cured in 8 month. I hope for cancer patients that it is easy to find the right treatments and healthy products, every body is different, and need a different therapies!

  3. I was recently diagnosed with her2+ breast cancer. A year before that I started having mild neurological concerns (dizziness, balance, headaches, off feeling, great anxiety then had abnormal EEG.) I meet with oncologist tomorrow for latest pathology report regarding my breast cancer. Fearing the worst…brain met. Yet praying for good report.

    1. Hi Vyvyan,
      Thanks for your comment, I can certainly appreciate your concern. Some of those neurological problems can be directly related to the standard medical treatments like chemotherapy, Herceptin and/or the hormone blocking medications, particularly if you are not taking anything from the natural medicine realm to help combat their toxic effects. Were you told this by your doctors? If I can help you please do let me know.
      Warmest regards,
      Marnie Clark

  4. I was a little worried as I have been infusing Doterra lavender oil every night when I go to bed. I am currently two thirds through my chemo treatments for invasive breast cancer, stage 2. Heals me sleep. Glad to read that it is beneficial rather than dangerous. Thanks so much.

    1. Hi Karen,
      I’m glad the info helped you. Yes, lavender does indeed help with sleep and so many other things. It is known as the Swiss army knife of the essential oil world! Ha ha! But true. Thanks for commenting and if I can help you further, let me know.
      All the best
      Marnie Clark

  5. I was so happy to find this information and your link above. I was diagnosed in December 2016 with triple positive breast cancer and have been using EO’s for a few years. As Alie mentioned above, it’s quite numbing when you get the diagnosis and while I research like crazy it’s difficult to do it all. I had seen several passing comments about lavender and was a little concerned, but had not had the chance to really research, I just limited my exposure to it. Now I don’t have to! Thank you so much! I will also be looking into the other information you have.

  6. Thank you for the info! I am post menapausal, 60’s. I have been using tea tree oil for 2 months to help in healing a rather deep tissue injury on my leg. 2 weeks ago a large mass appeared in my breast – 3 weeks after a clear report on my mammo. Awaiting surgery in a few days but wondering….could the tea tree oil have contributed, due to its estrogen properties? Just curious. Thank you.

    1. Hi Kathleen,
      If you read my article carefully, you will note that properly distilled, medicinal grade tea tree oil has a long history of safe use. Especially see point 5. I would very much doubt that it caused the mass in your breast. They say it takes up to ten years before a palpable mass can be detected in the breast. Like you, I had a large mass that seemed to suddenly blow up but the reality is that it was probably lying there undetected for quite some time and my immune system suddenly took a hit with a combination of stress and rampant candida. If you were using a cheap grade of tea tree oil that contained petrochemicals or other unsafe chemicals, it may have been a contributing factor to the tumor’s sudden spurt of growth, but that’s something you probably will never know. Bottom line – if you’re going to use essential oils, make sure they are high quality oils. Not the cheaper ones you generally find in the health food store. I only use Young Living oils and a couple of others like Organixx. I hope this information helps you.
      Warmest regards,
      Marnie Clark

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