Several DEET-free mosquito repellents provide protection that rivals or matches DEET, and they’re all registered with the EPA as safe and effective. The best options are picaridin, IR3535, and oil of lemon eucalyptus (OLE). Each has a different strength profile, so the right choice depends on how long you need protection, where you’re traveling, and who’s using it.
Picaridin: The Closest Match to DEET
Picaridin is the most popular DEET alternative worldwide and the one most often recommended by public health agencies. At a 20% concentration, it protects against mosquitoes for roughly the same duration as an equivalent concentration of DEET. It works by making your skin essentially invisible to mosquitoes, blocking the sensory cues they use to find you.
What makes picaridin stand out is what it doesn’t do. Unlike DEET, it won’t damage plastics, synthetic fabrics, or watch faces. It feels lighter on the skin, doesn’t leave a greasy residue, and has almost no odor. If you’ve avoided DEET because of the sticky, chemical feel, picaridin solves that problem without sacrificing effectiveness. Look for products with 20% picaridin for the longest protection window, which typically runs 8 to 14 hours depending on the formulation and conditions.
IR3535: Strong Against Common Mosquitoes
IR3535 has an unusual origin story. It was first sold in the U.S. as a skin moisturizer before researchers noticed it repelled biting insects as effectively as DEET. A 20% IR3535 product protects against the mosquito species that carry Zika, dengue, and West Nile virus (Aedes and Culex) for 7 to 10 hours. Against Anopheles mosquitoes, which carry malaria, protection drops to roughly 4 hours, so it’s a better fit for North America and Europe than for tropical malaria zones.
IR3535 actually outperforms DEET against black flies and sand flies, offering longer-lasting protection against those particular biters. One drawback worth knowing: like DEET, it can melt some plastics and damage certain fabrics. Keep it away from sunglasses, phone screens, and synthetic clothing until it dries.
Oil of Lemon Eucalyptus (OLE)
OLE is the only plant-derived repellent that the CDC lists alongside synthetic options. The active compound, PMD, is refined from the leaves of the lemon eucalyptus tree (or produced synthetically). At 30% concentration, OLE provides roughly 6 hours of mosquito protection, which puts it in the same range as lower-concentration DEET products.
Products with less than 10% active ingredient, whether OLE or anything else, tend to offer only 1 to 2 hours of protection. That’s a common pitfall with “natural” repellent sprays that list lemon eucalyptus on the label but use very little of the actual active compound. Check the percentage on the back, not just the marketing on the front. A key restriction: OLE should not be used on children younger than 3 years old, per both the EPA and the American Academy of Pediatrics.
2-Undecanone: The Newer Option
2-Undecanone is the newest EPA-registered repellent on the market, derived from wild tomato plants. It’s available in a handful of consumer products and provides moderate protection, though less data exists on its duration compared to picaridin or IR3535. It’s a reasonable choice for short outdoor activities in areas with light mosquito pressure, but not the strongest pick for heavy exposure or travel to disease-risk areas.
What About Citronella and Essential Oils?
Citronella candles, essential oil blends, wristbands, and patches are widely sold as mosquito repellents, but none are EPA-registered, and testing consistently shows they provide minimal protection. Citronella oil applied to skin evaporates quickly and rarely lasts more than 20 to 30 minutes. Lavender, peppermint, and other essential oil blends perform similarly. If you’re in an area with disease-carrying mosquitoes, these products are not a substitute for an EPA-registered repellent.
Safety for Children and Pregnancy
All EPA-registered repellents, including picaridin, IR3535, and OLE, are considered safe during pregnancy and breastfeeding when used as directed. The CDC specifically advises that protecting against mosquito bites during pregnancy is important enough that the benefits of using a registered repellent outweigh any theoretical risk, especially in regions where mosquito-borne diseases circulate.
For children, picaridin and IR3535 have no minimum age restriction and can be applied by a parent to infants. OLE is the exception: it should not be used on children under 3. For any repellent, apply it to your own hands first and then rub it onto a child’s skin, avoiding their hands, eyes, and mouth. Don’t apply repellent under clothing.
Choosing the Right One
- Longest all-around protection: 20% picaridin. Works against the broadest range of mosquitoes, won’t damage gear, and feels comfortable on skin.
- Best for black flies and sand flies: 20% IR3535. Outperforms DEET against these specific insects, with 7 to 10 hours of mosquito protection as a bonus.
- Plant-derived with real data: 30% OLE. Solid protection for moderate exposure, though not suitable for young children.
- Short outdoor activity, low risk: 2-undecanone or lower-concentration picaridin.
Concentration matters more than brand. A 20% picaridin spray from a store brand works the same as a 20% picaridin spray from a premium label. The active ingredient percentage, listed on every EPA-registered product, is what determines how long you’re protected.