Natural vs Synthetic Insect Repellent: Is "Natural" Safer?
No. "Natural" is not a safety rating or an effectiveness rating. Some plant-based products have real evidence and EPA registration, and some do not. Some synthetic ones, such as DEET, carry fewer age restrictions than plant-derived oil of lemon eucalyptus. Judge a repellent by its EPA registration number and label, not by the word natural.
Lemon Eucalyptus Essential Oil
Our own Lemon Eucalyptus Essential Oil, in sizes from 0.5 oz to bulk.
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Shop Now →We sell a natural product, and it is the wrong answer to this question
We sell Lemon Eucalyptus Essential Oil, a plant-derived, steam-distilled oil. People often arrive here from a search for a "natural bug spray" assuming that is the product they want. It is not. Our oil is not a registered repellent, and our stance page says we will not imply otherwise. A natural origin did not make it a repellent, and it does not make anything else safer. That is the honest starting point for the rest of this page.
The claim-versus-reality table
| Common claim | What the sources show |
|---|---|
| "Natural means safer" | NPIC says "The health risks and efficacy of essential oils have not been as widely studied as common insect repellents," and that oil of lemon eucalyptus "can cause significant eye damage." EPA says normal DEET use "does not present a health concern to the general population, including children." |
| "Chemical-free" | Every repellent is made of chemicals. PMD, the active in refined oil of lemon eucalyptus, is one. The label question is which chemical, at what percentage, and who reviewed it. |
| "Natural repellents work just as well" | Mixed. Registered OLE and PMD products performed near DEET in one lab study. Unregistered botanical-oil products varied widely and wore off sooner in the tests below. |
| "EPA-approved" | EPA registration means the company supplied effectiveness data. EPA's own search tool says that listing "is not an endorsement." |
| "Plant-derived so it is natural, so it is unregulated" | Oil of lemon eucalyptus is plant-derived and EPA-registered. CDC lists it as "a plant-derived ingredient" among its six recommended actives. |
The review by Maia and Moore in Malaria Journal (2011) makes the same point from the research side: plant-based products are often seen as safer than synthetic repellents, though that perception is sometimes mistaken, and few studies have followed standard WHO testing guidelines (Europe PMC record).
Three regulatory buckets, not two
The natural-versus-synthetic split hides the distinction that matters:
- EPA-registered repellents. Includes DEET, picaridin, IR3535, oil of lemon eucalyptus, PMD and 2-undecanone. CDC says choosing a registered product "ensures the EPA has evaluated the product for effectiveness." Some of these are synthetic, one is plant-derived.
- Minimum-risk "exempt" products. EPA exempts certain low-risk pesticides from registration. Many "natural" sprays sit here. EPA says it is "considering a proposal to remove personal mosquito and tick repellents from the minimum risk pesticides exemption," and that public health products "must be supported by evidence that they are effective against the target pest" (EPA). That is a proposal under review, not a final rule.
- Everything else. Bracelets, patches, candles and raw essential oils. CDC: "We do not know the effectiveness of non-EPA registered insect repellents, including some natural repellents."
NPIC adds a useful negative: "There are no EPA-registered repellents that contain garlic oil, rosemary, lemongrass, thyme, or geraniol oils." If a product lists those as its repellent ingredients, it is in the second or third bucket. Our ingredient comparison lays out the registered actives, and lemon eucalyptus versus other essential oils covers how the plant oils rank by evidence.
What testing says about natural-labeled products
Burtis and colleagues tested 11 minimum-risk tick repellent products and two DEET-based products on blacklegged tick nymphs in a finger bioassay. The DEET products repelled 97 percent or more of ticks at every checkpoint. The 11 exempt products repelled an average of 63 percent in the first 1.5 hours and 3 percent from 2.5 to 6.5 hours. The authors report that label claims, active ingredients and concentrations did not predict how long the products worked (Parasites & Vectors, 2024). A 2024 review by Lars Eisen in Emerging Infectious Diseases concluded that effectiveness varies considerably among unregulated minimum-risk products.
In the 2017 wind-tunnel study by Rodriguez and colleagues, with 88.82 percent of mosquitoes attracted to an untreated human bait at 1 m, a 30 percent OLE spray cut it to 29.62 percent and a 98 percent DEET spray to 33.70 percent. A plant-oil blend spray (citronella 10 percent among other oils) cut it to 59.66 percent, a smaller effect, and at 3 m it was 73.31 percent attracted against a 91.25 percent control (J Insect Sci, 2017). That is one species in a lab and measures attraction, not bites. The pattern still matters: the plant-derived product that did well was the refined, registered one.
The safety trade-offs, ingredient by ingredient
| Ingredient | Origin | Cautions stated by the sources |
|---|---|---|
| DEET | Synthetic | EPA: no risks of concern identified in its 2014 review; approved for children with no age restriction. NPIC: can cause short-term eye or skin irritation. |
| Picaridin | Synthetic | NPIC: skin and eye irritation reported; vomiting also reported. |
| IR3535 | Synthetic | NPIC: "IR3535 is an eye irritant." |
| OLE and PMD | OLE is refined from lemon eucalyptus leaf oil; EPA lists PMD separately | CDC: not for children under 3. NPIC: can cause significant eye damage. |
| Raw essential oils | Plant | No registered repellent status; effectiveness unknown per CDC; skin reactions possible, with dilution advised by poison.org. |
Read that table the way a pharmacist would: the safest repellent depends on who is using it and where. DEET's record is the best documented for young children. OLE and PMD are an alternative for adults and older children who do not want DEET, and CDC says they are not for the youngest. We go through the age question in our guide on lemon eucalyptus for kids.
Where we land
Our recommendation, from the seller's vantage: if you want something plant-derived and protective, buy a registered oil of lemon eucalyptus or PMD repellent from a company that makes them, for adults and children age 3 and up, and follow the label. If you are traveling to a disease area, are choosing for a toddler, or need many hours of protection, the label and a clinician should decide, and the clinic may point you to a registered synthetic active. If you want a plant-oil product only because it is natural, check whether it has an EPA registration number. If it does not, you do not know how well it works, and the CDC says so.
We would also say that a "natural" repellent can be a fine product for casual, low-risk use if the buyer understands it may fade within an hour or two. What we object to is the leap from natural to proven or natural to harmless. A deeper walk-through of what a lemon eucalyptus repellent must show on its label is in our buyer's guide, and the safety questions are in the safety guide. For the question of a do-it-yourself essential oil mix, see why DIY is not the same as a registered OLE repellent.
Five questions that replace the word "natural"
- Is there an EPA registration number on the label? EPA says that number means the company provided technical information on the product's effectiveness. Without it, CDC says effectiveness is unknown.
- What is the active ingredient, and at what percentage? A front-of-box list of plant names is not the same as an active-ingredient panel.
- What does the label say about children? Age rules differ by active, as the table above shows.
- What is the stated protection time, and what is it based on? A time on the label of a registered product has been through review. A time in an advertisement has not.
- What does the label say about eyes, skin and first aid? If a product has no first-aid text at all, that tells you something about how it was brought to market.
A short decision guide
| Your situation | Better starting point |
|---|---|
| Adult, backyard, short time outdoors, prefers plant-derived | EPA-registered OLE or PMD product; check the protection time on the label |
| Child under 3 | No OLE or PMD per CDC; ask the pediatrician; use non-product measures |
| Disease-risk area or trip | Registered repellent chosen with a travel-medicine clinic |
| Sensitive skin or past reaction | Ask a dermatologist before trying anything new |
| Only want scent, not protection | A scent product, with no repellent expectation |
If scent is your goal, our Lemon Eucalyptus Essential Oil is on the shop page. It is for candles, diffusers and craft, not bug protection.
FAQ
Is DEET more dangerous than natural repellents?
EPA's 2014 review says it identified no risks of concern to human health, and that normal use does not present a health concern including to children. That is a regulatory finding, not a guarantee for every person. NPIC notes short-term eye or skin irritation can occur.
Are plant-based repellents EPA-registered?
Some are. Oil of lemon eucalyptus and PMD are. Many other botanical sprays are exempt minimum-risk products with no registration number.
Can I rely on a "natural" label for kids?
No. Natural does not mean child-safe. CDC says not to use OLE or PMD products on children under 3. Ask a pediatrician.
Last reviewed: October 2026
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: Preventing Mosquito Bites
- EPA: DEET
- EPA: Find the Repellent that is Right for You
- EPA: Personal Insect Repellents and Minimum Risk Pesticides
- NPIC: Insect Repellents Fact Sheet
- poison.org: Essential oils
- Maia MF, Moore SJ (2011). Plant-based insect repellents. Malar J 10 Suppl 1
- Burtis JC et al. (2024). Parasit Vectors 17:50
- Eisen L (2024). Emerg Infect Dis 30(1):1-7
- Rodriguez SD et al. (2017). J Insect Sci 17(1):24