Two natural tick repellents are EPA-registered and backed by solid evidence: oil of lemon eucalyptus (OLE) and a compound derived from wild tomato plants called 2-undecanone. Beyond those, the list of plant-based options that actually work against ticks is much shorter than the internet suggests. Many popular essential oils have little to no proven effect on ticks, and a few pose real safety risks for children and pets.
The Two EPA-Registered Natural Options
Oil of lemon eucalyptus is the most widely available natural tick repellent with regulatory backing. It works through a concentrated form of a compound called PMD, which occurs naturally in the leaves of the lemon eucalyptus tree. Commercial OLE products use a lab-made version of PMD at around 30% concentration, and they provide roughly 2 to 5 hours of protection against ticks and mosquitoes. In lab studies, PMD applied to clothing repelled ticks for several days to a full week depending on the tick species and fabric type, performing comparably to DEET at every time point measured across six-hour tests.
There’s an important distinction here: the refined, EPA-registered product labeled “oil of lemon eucalyptus” is not the same thing as pure lemon eucalyptus essential oil sold in health food stores. The essential oil contains very low concentrations of PMD and is not approved as a tick repellent. If you’re shopping for OLE, look for an EPA registration number on the label.
The second option, 2-undecanone, is a naturally occurring compound found in wild tomato plants. It’s effective against both ticks and mosquitoes, and at high concentrations it has matched DEET’s performance. At lower concentrations, its effectiveness compared to other repellents is less clear. Products containing 2-undecanone are less common on store shelves than OLE, but they’re worth seeking out if you want a plant-derived alternative.
How OLE Compares to DEET
OLE works, but it doesn’t last as long as DEET or picaridin. Where a 20-30% DEET product can provide protection for several hours before needing reapplication, OLE tops out at about 5 hours under ideal conditions and often needs reapplication sooner. Sweating, rain, humidity, and swimming all wash repellent off faster. If you’re on a long hike or working outdoors all day, plan to reapply OLE more frequently than you would a synthetic repellent.
When applied to fabric rather than skin, PMD holds up significantly better. Lab testing showed it continued repelling ticks on treated clothing for days, which makes spraying your pants, socks, and shoes a smart strategy for extending protection between skin applications.
Cedarwood Oil Shows Promise
Among essential oils without EPA registration, cedarwood oil has the strongest laboratory evidence. USDA researchers tested it against the nymph stages of five hard-bodied tick species and found it repelled 80 to 94 percent of blacklegged tick nymphs on contact. Against blacklegged ticks specifically, cedarwood oil performed as well as DEET in the lab. Its effectiveness varied by species, though. Blacklegged ticks were the most susceptible, followed by brown dog ticks, American dog ticks, and lone star ticks in decreasing order.
The catch is that cedarwood oil’s repellency dropped noticeably within an hour. At 30 minutes after application, 94 percent of blacklegged tick nymphs were repelled; by 60 minutes, that had fallen to 80 percent. The active ingredient responsible, cedrol, is being studied for ways to boost its concentration and staying power, but for now cedarwood oil fades faster than commercial repellents. It’s a reasonable short-duration option but not a substitute for EPA-registered products on a long outing.
Essential Oils That Don’t Work on Ticks
Many essential oils marketed as tick repellents have little or no proven effectiveness. Citronella, cinnamon, peppermint, sandalwood, geranium, and soybean oil are all either ineffective or only minimally effective against ticks. Repellent bracelets, vitamin supplements, and herbal remedies also fail to provide meaningful protection.
This matters because ticks are not insects. They sense hosts differently, and a product that works well against mosquitoes may do nothing against ticks. Citronella is a good example: it has some mosquito-repelling ability but essentially fails against ticks. Always check whether a product specifically lists ticks on the label, not just mosquitoes or “bugs.”
Safety Concerns for Children
Oil of lemon eucalyptus should not be used on children under 3 years old. This age restriction comes from both the CDC and the American Academy of Pediatrics. For younger children, the AAP recommends EPA-registered repellents with DEET or picaridin instead, applied by an adult to exposed skin (never on hands that might touch the mouth or eyes).
Pure essential oil products that aren’t EPA-registered present a different problem: they haven’t been tested for safety as insect repellents at all. A product being “natural” doesn’t mean it’s been evaluated for use on children’s skin, and some essential oils can cause skin irritation or allergic reactions in kids.
Essential Oil Risks for Pets
Several essential oils commonly found in natural tick sprays are toxic to dogs and cats. Tea tree oil is the most frequently reported cause of essential oil poisoning in pets. Eucalyptus, cedar, cinnamon, pennyroyal, birch, and wintergreen oils can all cause serious problems ranging from liver damage to seizures. Wintergreen and birch oils contain high levels of a compound that acts like aspirin in the body, which can be dangerous for animals even in small amounts.
If you use a natural tick repellent on yourself, keep treated skin and clothing away from pets who might lick or nuzzle the area. Never apply a product formulated for humans to a dog or cat, and be especially cautious with cats, who are more sensitive to essential oils than dogs because they metabolize these compounds more slowly.
How to Get the Most From Natural Repellents
Apply repellent to all exposed skin in a light, even coat. You don’t need to soak your skin. You can also spray it on clothing, though for fabric treatment, permethrin (a synthetic option) is more effective at keeping ticks off clothes than any natural repellent applied the same way. Don’t apply repellent under clothing, where it can’t create a vapor barrier between your skin and an approaching tick.
Reapplication is the biggest practical difference between natural and synthetic repellents. With OLE, plan to reapply every 2 to 3 hours, sooner if you’re sweating heavily or it’s raining. Pair repellent with physical barriers: tuck pants into socks, wear light-colored clothing so you can spot ticks, and do a full body check when you come inside. No repellent is 100 percent effective, and the ones that come closest still work best as part of a layered approach.
For clothing you wear repeatedly in tick habitat, treating fabric with PMD offers surprisingly long-lasting protection. Lab tests showed treated clothing repelling ticks for days, making it a practical option for gear like hiking pants or gardening clothes that see regular outdoor use.