DEET remains the most reliable tick repellent for humans, particularly at concentrations between 15% and 30%. But it’s not the only good option. The CDC recommends five active ingredients that provide meaningful protection against ticks, and the best choice depends on how long you’ll be outdoors, your sensitivity to certain chemicals, and whether you’re protecting a child.
The Five Proven Active Ingredients
The CDC and EPA recognize five active ingredients that effectively repel ticks. They differ mainly in how long they last and how they feel on skin.
DEET is the most studied and longest-used repellent, providing 2 to 10 hours of tick protection depending on the concentration. A product with 30% DEET will last significantly longer than one with 10%. In Consumer Reports testing, DEET products at 15% and 30% concentrations offered the longest-lasting tick protection of any ingredient tested. It has a strong chemical smell and can feel oily, which some people dislike, but decades of safety data back its use.
Picaridin is a synthetic compound that works similarly to DEET but feels lighter on skin, doesn’t damage plastics or fabrics, and has almost no odor. It provides 3 to 10 hours of protection against ticks. Despite these advantages, picaridin finished behind DEET in Consumer Reports’ tick-specific testing at 20% concentration.
IR3535 is common in European products and lasts about 4 to 6 hours against ticks. It’s classified as a biopesticide, meaning it’s derived from natural materials, and tends to be gentle on skin.
Oil of lemon eucalyptus (OLE) is the strongest plant-based option, offering 2 to 5 hours of protection. This is a refined, EPA-registered product, not the same as lemon eucalyptus essential oil you’d find at a health store. The pure essential oil hasn’t been validated for safety or efficacy as a repellent. In Consumer Reports testing, a 30% OLE spray performed respectably, landing between DEET and picaridin for tick protection.
2-undecanone is the newest EPA-registered option, derived from tomato plants, and provides 2 to 4 hours of protection. It’s the shortest-lasting of the five.
How Concentration Affects Protection Time
Higher concentrations don’t repel ticks more effectively per se. They last longer. A 10% DEET product might protect you for a couple of hours, while 30% DEET can work for most of a day outdoors. The same principle applies to picaridin and OLE. If you’re doing a quick yard cleanup, a lower concentration is fine. For a full-day hike in tick habitat, go with 20% to 30% DEET or picaridin.
There’s no benefit to going above 30% DEET for most situations. The additional protection time plateaus, and higher concentrations are more likely to irritate skin.
Permethrin: The Clothing Layer
The most effective tick prevention strategy combines a skin repellent with permethrin-treated clothing. Permethrin isn’t a repellent you put on skin. It’s an insecticide applied to clothing, shoes, hats, and gear that kills ticks on contact. At 0.5% concentration, it repels and kills ticks, mosquitoes, and chiggers.
You can buy permethrin spray and treat your own clothes, which stays effective through about 6 washings. For longer-lasting treatment, services like Insect Shield will treat clothing to remain effective through 70 washings, roughly a full spring-to-fall season. You can also buy pre-treated clothing from several outdoor brands.
Permethrin-treated clothing is especially valuable because ticks crawl upward from ground level. Treated socks, shoes, and pants intercept ticks before they ever reach bare skin. Pairing treated pants and shoes with a DEET or picaridin spray on exposed skin gives you the strongest practical protection available.
What Works for Kids
Children need tick protection too, but a few ingredients have age restrictions. Products containing OLE or PMD should not be used on children under 3 years old due to the risk of allergic skin reactions. DEET is considered safe for infants and children, though the American Academy of Pediatrics recommends applying it sparingly on kids under 2, since their skin absorbs chemicals differently. Picaridin has no specific age restriction and is a good alternative for families who prefer to avoid DEET.
For any repellent, apply it to your own hands first, then rub it onto your child’s skin. Avoid their hands, eyes, and mouth. When they come inside, wash treated skin with soap and water.
Application Tips That Affect Performance
How you apply repellent matters as much as which one you choose. A few practical details can make a real difference in how well it works.
If you’re also wearing sunscreen, apply sunscreen first and let it absorb, then apply repellent on top. Reversing this order can reduce the effectiveness of both products. Avoid combination sunscreen-repellent products when possible, because sunscreen needs reapplication every two hours while repellent typically doesn’t. Reapplying the combo product too often means overusing the repellent.
Spray repellent on all exposed skin, not just ankles and legs. Ticks can latch onto arms, necks, and hairlines. Apply evenly rather than in heavy patches. If you’re sweating heavily or swimming, reapply sooner than the label suggests, since water and perspiration break down protection faster.
Choosing the Right Repellent for Your Situation
For maximum tick protection on a long hike or camping trip, use 20% to 30% DEET on exposed skin and permethrin-treated clothing. This combination is what the CDC recommends for people in high-risk tick areas, and it’s the approach most likely to prevent bites from the species that carry Lyme disease and other tick-borne illnesses.
For everyday yard work or short outdoor outings, 20% picaridin is a comfortable, effective choice that won’t leave your skin feeling greasy. It’s also less likely to damage synthetic fabrics or watch faces, which DEET can dissolve.
For those who prefer plant-based products, a 30% OLE spray is the only natural option with solid testing data behind it. Just keep in mind it needs reapplication sooner than DEET or picaridin, typically every 2 to 5 hours. Essential oil blends like citronella, peppermint, or lemongrass have not been validated by the EPA for tick protection and generally wear off within an hour or less.