Oil of Lemon Eucalyptus: What It Is, How Well It Works, and How to Use It Safely
Oil of lemon eucalyptus (OLE) is a refined extract of the lemon-scented gum tree, enriched in PMD (para-menthane-3,8-diol) and registered with the US EPA as an insect repellent ingredient. It is not the same as plain lemon eucalyptus essential oil, which CDC does not recommend as a repellent.
Lemon Eucalyptus Essential Oil
Our own Lemon Eucalyptus Essential Oil, in sizes from 0.5 oz to bulk.
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Shop Now →One thing before anything else: we sell the essential oil, not a repellent. Our Corymbia citriodora leaf oil is a fragrance and craft ingredient, and our stance page says plainly that it is not a registered repellent. If you came here for bug protection, the right purchase is an EPA-registered product from a company that sells one. This guide explains what to look for in that product, and why we are the wrong shop for it. (The tree itself, and the aroma of the oil, are covered in the complete guide to lemon eucalyptus oil.)
The OLE fact card
| Question | Short answer | Source |
|---|---|---|
| What is it? | A plant-derived repellent ingredient made from lemon eucalyptus oil, with PMD concentrated | CDC, EPA |
| Who regulates it? | EPA lists OLE as an active ingredient that "contains PMD, but is a separately regulated pesticide chemical" | EPA |
| On CDC's recommended list? | Yes, as an ingredient in EPA-registered products. CDC does not recommend "pure" oil of lemon eucalyptus | CDC |
| Age limit | CDC says not for children under 3, with one label-dependent exception (see below) | CDC |
| Where to apply | Exposed skin and clothing only, never under clothing | EPA, CDC |
| How long does it last? | Depends on the product, the pest and conditions; read the label (see our duration guide) | EPA |
What OLE actually is
Lemon eucalyptus essential oil is steam distilled from the leaves of Corymbia citriodora, and its main component is citronellal. One review puts that oil at about 85% citronellal (Maia and Moore, Malaria Journal, 2011). PMD is a different molecule. EPA's fact sheet says PMD "occurs naturally in the lemon eucalyptus plant" but that "for commercial use, the active ingredient is chemically synthesized", and that it is "structurally similar to menthol" (EPA PMD fact sheet, 2000).
OLE is the version made by processing the distilled oil. The ingredient supplier Citrefine describes steam distilling the leaves and then converting the citronellal in the oil into PMD in "a simple process" (Citrefine, a manufacturer page, so treat it as the company's own account). A real EPA-stamped label from 2007 for a Repel pump spray (EPA Reg. No. 305-57) lists the active ingredient as "Oil of Lemon Eucalyptus" with a footnote reading "Approx. 65% p-menthane-3,8-diol" (EPA label, 2007). So a product that says "30% oil of lemon eucalyptus" does not contain 30% PMD. On that label's footnote ratio it would be roughly 20%, which is our arithmetic, not a label statement. Our PMD explainer goes deeper into the chemistry.
Is OLE the same as lemon eucalyptus essential oil?
No, and this is the most expensive mistake in the category. CDC's Yellow Book states that it "does not recommend using 'pure' oil of lemon eucalyptus (an essential oil that is not formulated) as a repellent", because it has not had validated safety and efficacy testing and is not EPA-registered as a repellent (CDC Yellow Book, April 2025). The 2011 review above reports the essential oil as repellent for about an hour in one cited study, and notes it has no EPA registration as a repellent.
Our position: if the label does not carry an EPA registration number and an insect-repellent directions panel, it is not an OLE repellent, whatever the front says. Our bottle is a 100% pure essential oil. We would not tell anyone to put it on skin or clothes to keep bugs off, and we give no dilution advice for that purpose. The full side-by-side is in OLE vs lemon eucalyptus essential oil.
How well does it work?
The honest answer is "well enough to be on CDC's list, with a very wide spread between products, pests and people." The evidence, from sources we opened:
- Mosquitoes, lab. In a 2004 laboratory comparison of commercial products, Repel (26% PMD) prevented biting for 7.2 hours or more averaged across three mosquito species, and had the highest repellency index (1.7) relative to a 7% DEET product (Barnard and Xue, J Med Entomol, 2004, abstract).
- Review of the field. A 2006 review by Carroll and Loye concluded CDC's 2005 endorsement of PMD was warranted and probably understated its value as a DEET alternative (J Am Mosq Control Assoc, 2006, abstract).
- Ticks, lab. An EPA science review of one 30% OLE pump spray (Coleman Botanicals, EPA Reg. No. 84878-2) found median complete protection times of 290 minutes for the blacklegged tick, 512 minutes for the brown dog tick, and more than 600 minutes for the lone star tick, with 25 volunteers per species. EPA accepted data supporting a complete protection time of up to 4 hours (EPA memo, June 2020). Individual volunteers ranged from 15 minutes to 466 minutes for the blacklegged tick, which is the point: averages hide misses.
- Against DEET. An older arm-in-cage study found a 23.8% DEET product protected for an average of 301.5 minutes, and concluded that the non-DEET products it tested could not be relied on for prolonged protection where mosquito-borne disease is a serious threat (Fradin and Day, NEJM, 2002, abstract). That study predates much later OLE work, so do not read it as a verdict on registered OLE products.
Our read: for casual use in places where bites are a nuisance, registered OLE is a reasonable choice. Where a bite carries real health risk, a clinic that specialises in travel medicine should choose the ingredient, not a shop and not an article.
What CDC and EPA say
CDC's list of active ingredients in EPA-registered repellents is DEET, picaridin, IR3535, oil of lemon eucalyptus, PMD and 2-undecanone (CDC, August 2024). EPA's skin-applied repellent page counts six registered products for OLE and six for PMD at the time we read it, against more than 500 for DEET (EPA). That small shelf is worth knowing: you have fewer products to compare, so label checking is quick.
Who should not use it, and the under-3 rule
Two CDC pages differ, and we will not average them. The CDC mosquito-prevention page (August 2024) says "Do not use products containing OLE or PMD on children under 3 years old." The CDC Yellow Book (April 2025) says parents should not use OLE or PMD products on children under 3 to avoid potential allergic skin reactions, then adds that certain products with OLE as their only active ingredient at 30% or less can be used, and that parents should always read the label first. The 2007 EPA-stamped Repel label says "Do not apply to children under the age of three years." Practical rule: the label on your bottle governs, and if a child under 3 is involved, ask a pediatrician before using any OLE or PMD product. Kids older than 3 still need an adult to apply it, and not to their hands.
Other cautions from the same sources: EPA's fact sheet notes the only adverse effect in animal studies was eye irritation, which is why labels warn about eyes. The 2007 label also warns it may cause skin reactions for some people and is flammable. Stop use and see a pharmacist or physician if a rash appears.
How to apply it
Follow the label first; the 2007 label states it is "a violation of Federal law to use this product in a manner inconsistent with its labeling." CDC adds: apply sunscreen first and repellent second, avoid combination sunscreen-repellent products, use only enough to cover exposed skin, and for faces spray your hands first. EPA says not to use repellents under clothing and to wash skin and clothes with soap and water after coming indoors. Step-by-step: how to apply lemon eucalyptus repellent correctly.
OLE next to the other repellents
| Ingredient | EPA category (CDC wording) | One verified fact |
|---|---|---|
| OLE / PMD | Biopesticide repellents | Not for children under 3, subject to the label exception above |
| DEET | Conventional | Efficacy tends to peak at about 50% concentration (CDC) |
| Picaridin | Conventional | CDC gives no separate duration figure |
| IR3535, 2-undecanone | Biopesticide | Listed with OLE and PMD as biopesticide repellents (CDC) |
| Permethrin | Clothing only | "Should never be applied to the skin" (CDC) |
The full ingredient comparison is in insect repellent ingredients compared.
Label-claims table, from a real EPA label
| Label item | What the 2007 Repel Essential label (EPA Reg. No. 305-57) says |
|---|---|
| Active ingredient | Oil of lemon eucalyptus, footnoted "Approx. 65% p-menthane-3,8-diol" |
| Directions | "To repel insects, apply to exposed skin and clothing"; "Reapply once as needed. Do not apply more than twice per day" |
| Optional marketing claim | "Repels mosquitoes (and deer ticks) for up to six hours" |
| Children | "Do not apply to children under the age of three years" |
| Other | Flammable; avoid eyes; do not apply over cuts, wounds or irritated skin |
This label is 2007-dated and current products may differ. Use it as a model of what to read, not as today's claims. We do not recommend or sell any product named here and have no affiliation with it.
How to choose an OLE product
- Find an EPA registration number on the label.
- Read the active-ingredient line for "oil of lemon eucalyptus" or "PMD" and its percentage.
- Check that the label lists the pest you care about, such as ticks, since claims vary by product.
- Read the age statement.
- Pick a format you will actually reapply (buyer's guide).
Frequently asked questions
Is OLE natural?
It is plant-derived, and CDC calls it a plant-derived ingredient. EPA says PMD is chemically synthesized for commercial use. "Natural" does not tell you about safety; see the safety guide.
Does it work as well as DEET?
Lab data show strong results for some PMD products, but CDC notes DEET efficacy peaks near 50% and the long-duration evidence is largest for DEET. Compare per product, per pest.
How often should I reapply?
As the label directs. One historical label said reapply once as needed and no more than twice per day. CDC says not to reapply more often than the label allows.
Can I make my own?
We do not give recipes. Homemade mixtures are not EPA-registered products and have no validated protection time.
Last reviewed: October 2026. This guide reports regulator and journal statements; it is not medical advice. Ask a pharmacist, physician or pediatrician about your situation, and call Poison Help at 1-800-222-1222 if someone swallows a repellent or gets it in the eyes.
If what you want is the aroma, scent blending and crafts, our essential oil is on the shop page.
Lemon Eucalyptus Essential Oil
Lemon Eucalyptus Essential Oil from our own shop, in sizes from 0.5 oz to bulk.
From $9.99
Shop Now →Sources & Further Reading
- CDC Yellow Book: Mosquitoes, Ticks, and Other Arthropods (April 2025)
- CDC: Preventing Mosquito Bites
- EPA: Skin-applied repellent ingredients
- EPA: Using insect repellents safely and effectively
- EPA: p-Menthane-3,8-diol fact sheet (2000)
- EPA science review: 30% OLE pump spray against three tick species (2020)
- EPA-stamped label: Repel Essential pump spray (2007)
- Maia and Moore, Plant-based insect repellents (Malaria Journal, 2011)
- Barnard and Xue (2004)
- Carroll and Loye (2006)
- Fradin and Day (2002)
- Poison Help, poison.org