Several insect repellents work as well as DEET without the greasy feel or the damage to plastics and synthetic fabrics. The strongest alternatives, picaridin and IR3535, are both EPA-registered and can protect against mosquitoes and ticks for 8 hours or more at the right concentration. Oil of lemon eucalyptus offers a plant-derived option with solid performance, and a handful of essential oils provide short-term protection for lower-risk situations.
How DEET Alternatives Actually Work
Mosquitoes find you by detecting the odors your skin releases, particularly carbon dioxide, lactic acid, and other compounds in sweat. Research at Johns Hopkins University found that the major synthetic repellents, including DEET, picaridin, and IR3535, all work the same basic way: they reduce the volatility of human odors so mosquitoes can’t detect them. In calcium imaging experiments, these compounds suppressed the activity of mosquito olfactory neurons, essentially masking your scent rather than “repelling” insects in the way most people imagine. This means switching from DEET to picaridin or IR3535 doesn’t change the underlying strategy. You’re still hiding from mosquitoes, just with a different chemical doing the hiding.
Picaridin: The Closest Match to DEET
Picaridin is a synthetic compound modeled after a molecule found in pepper plants. It arrived in the U.S. market about 50 years after DEET and has proven roughly equal in repelling power. At a 20% concentration, picaridin protects against mosquitoes and ticks for 8 to 14 hours. A 10% concentration still provides 3.5 to 8 hours of coverage, which is enough for a long hike or an evening outdoors.
Where picaridin clearly beats DEET is in practical usability. It doesn’t damage synthetic fabrics, plastics, or gear like watches and sunglasses the way DEET can. It also feels lighter on the skin, with less of the oily residue that makes DEET unpleasant for many people. For tick prevention specifically, Harvard Health notes that 20% picaridin offers 8 to 14 hours of protection, compared to 2 to 4 hours for a similar concentration of DEET. Higher DEET concentrations (30% and above) can stretch to 8 hours against ticks, but picaridin achieves that range at a lower percentage.
Picaridin is safe for children of all ages when used as directed, and the CDC considers it appropriate during pregnancy and breastfeeding. It’s available as sprays, lotions, and wipes under brands like Sawyer and Natrapel.
IR3535: A Strong Option With Less Name Recognition
IR3535 has been used in Europe for decades but remains less well known in the U.S. At a 20% concentration, it protects against the most common North American mosquito species for 7 to 10 hours. Protection against certain tropical mosquito species (Anopheles) is shorter, around 3.8 hours in some studies, which matters if you’re traveling to malaria-endemic regions.
Like picaridin, IR3535 is gentler on skin and gear than DEET. It’s EPA-registered, safe for children, and cleared for use during pregnancy. You’ll find it in products like Avon Skin So Soft Bug Guard and Coleman SkinSmart. If your main concern is backyard mosquitoes or regional outdoor activities, IR3535 performs well. For travel to high-risk tropical areas, picaridin or DEET may be the stronger choice.
Oil of Lemon Eucalyptus: The Plant-Based Pick
Oil of lemon eucalyptus (OLE) is the only plant-derived repellent that carries EPA registration, putting it in the same regulatory category as DEET and picaridin. Its active compound, PMD, is actually a synthetic version of a chemical found in eucalyptus leaves and twigs. In U.S. testing, OLE provides protection comparable to 15% to 20% DEET, which translates to roughly 4 to 6 hours depending on the product and conditions.
The one important restriction: OLE should not be used on children under three years old. This is printed on the label and is the only age-specific warning among the EPA-registered repellents. For adults and older children looking for a botanical option with real data behind it, OLE is the clear frontrunner.
Essential Oils: Limited but Not Useless
Citronella, lemongrass, peppermint, and other essential oils do repel mosquitoes, but their protection times are dramatically shorter than EPA-registered ingredients. Research at New Mexico State University tested 20 essential oils in a standardized formulation and found that clove oil, cinnamon oil, and geraniol performed best, each providing protection for just over one hour. Citronella and lemongrass lasted about 30 minutes before needing reapplication.
That’s a workable option if you’re sitting on your porch for a short stretch, but impractical for a camping trip or any extended outdoor activity. You’d need to reapply constantly, and even then, coverage gaps are likely. Essential oils also aren’t EPA-registered, which means their concentrations and effectiveness aren’t standardized across products. A citronella candle and a citronella spray can contain wildly different amounts of the active compound.
If you prefer natural ingredients, OLE is the better bet. If you’re set on pure essential oils, treat them as a supplement to other strategies (long sleeves, permethrin-treated clothing, avoiding peak mosquito hours) rather than your primary defense.
Safety During Pregnancy and for Children
All four EPA-registered repellent types (DEET, picaridin, IR3535, and OLE/PMD) are considered safe during pregnancy and breastfeeding when used as directed. The CDC’s position is that the risk of mosquito-borne infections like Zika and West Nile virus outweighs any theoretical risk from the repellent itself. Current data show no increased risk of birth defects from EPA-registered repellents.
A few practical tips for pregnant and breastfeeding people: apply sunscreen first, then repellent, and avoid combination products since the two need different reapplication schedules. Keep repellent away from your mouth, eyes, and hands. If breastfeeding, avoid applying it near the nipple and areola. Wash treated skin when you come indoors.
For children, picaridin, IR3535, and DEET have no minimum age restriction beyond the general guidance to avoid applying repellent to infants’ hands (since they put their hands in their mouths). OLE is the exception, with a firm minimum age of three years.
Choosing the Right Alternative
- For all-around performance: Picaridin at 20% matches or exceeds DEET’s protection against both mosquitoes and ticks, without damaging gear or leaving a greasy film. It’s the most straightforward swap.
- For sensitive skin: Both picaridin and IR3535 are less irritating than DEET. IR3535 has the longest safety track record in Europe.
- For a plant-based option: OLE provides real, tested protection for several hours. It’s not as long-lasting as picaridin, but it’s far more reliable than essential oils.
- For outdoor gear protection: Picaridin and IR3535 won’t dissolve watch faces, tent coatings, or synthetic jacket fabrics the way DEET can.
- For tick-heavy areas: Picaridin at 20% is the strongest alternative, offering 8 to 14 hours of tick protection. Pairing any skin-applied repellent with permethrin-treated clothing gives you the most complete coverage.