Mosquito repellent lotions work by creating a vapor barrier on your skin that masks the chemical signals mosquitoes use to find you. The best ones use EPA-registered active ingredients that provide hours of protection, and choosing the right one comes down to matching the ingredient and concentration to your situation.
Active Ingredients That Actually Work
Not all repellent lotions are created equal. The EPA registers specific active ingredients for use against mosquitoes, and the protection you get depends entirely on which one is in the bottle and at what concentration.
DEET remains the most widely tested and effective option. Products containing 20 to 30 percent DEET provide protection for many hours and are considered the gold standard for preventing mosquito and tick bites. Lower concentrations still work but need to be reapplied sooner. A 10 percent DEET lotion might last about two hours, while 30 percent can stretch well beyond that.
Picaridin is a synthetic ingredient inspired by piperine, the compound that gives black pepper its bite. It performs comparably to DEET at similar concentrations and has the advantage of being nearly odorless and non-greasy, which makes it a popular choice in lotion form. Less than 6 percent of picaridin applied to human skin is actually absorbed into the body, and the EPA has determined it is not likely to cause cancer.
Oil of lemon eucalyptus (OLE) is the strongest plant-derived option. Its active component, PMD, has shown repellent activity and duration comparable to DEET in some studies. A 2015 comparison found that a lemon eucalyptus product had strong, long-lasting effects against one mosquito species and a still-significant effect on another. The effectiveness increases with PMD concentration, so look for products with 20 percent or higher for the best results.
IR3535 is a synthetic ingredient modeled after a naturally occurring amino acid. The EPA considers it very safe and classifies it as not a carcinogen in humans. It’s less common in the U.S. market but widely used in Europe.
2-undecanone is a newer registered ingredient derived from tomato plants. It’s available in some products but far less common than the others.
How Lotion Compares to Spray
Lotion formulations have a distinct advantage over sprays: you can see exactly where you’ve applied them, which means more even coverage and fewer missed spots. Sprays are prone to drift, especially outdoors in wind, and it’s easy to under-apply them. With a lotion, you rub it directly into exposed skin, creating a more consistent barrier.
Lotions also tend to feel less harsh. Picaridin and IR3535 lotions in particular go on smoothly without the sticky, chemical-heavy sensation some people associate with DEET sprays. The trade-off is convenience. Sprays are faster to apply over large areas and easier to use on hard-to-reach spots like the back of your neck. For the most thorough protection, a lotion on exposed skin paired with permethrin-treated clothing is a highly effective combination.
Using Repellent Lotion With Sunscreen
If you’re spending time outdoors in warm weather, you likely need both sunscreen and repellent. The CDC recommends applying sunscreen first, waiting about 10 minutes for it to absorb, and then applying your repellent lotion on top. This order matters because repellent needs to sit on the skin’s surface to create its vapor barrier, while sunscreen needs to bond with the skin to filter UV radiation.
Avoid combination sunscreen-repellent products. Sunscreen needs reapplication every two hours or after swimming, while repellent typically lasts longer. Reapplying a combo product on a sunscreen schedule means you’re putting on far more repellent than necessary. There’s also evidence that certain sunscreen formulations lose some of their UV-blocking ability when mixed with DEET.
Safety for Children
DEET-based lotions can be used on infants over two months old, with a maximum recommended concentration of 30 percent. For babies younger than two months, repellent should not be applied to the skin at all. Instead, use mosquito netting over carriers and strollers.
Oil of lemon eucalyptus products carry a label restriction against use on children under three years old. This is an important distinction because OLE is sometimes marketed as a “natural” alternative, which can give parents a false sense that it’s gentler for young kids. For children between two months and three years, DEET or picaridin lotions are the appropriate choices.
When applying repellent lotion to children, put it on your own hands first and then rub it onto their skin. Avoid their hands entirely, since kids touch their eyes and mouths frequently. Don’t apply it under clothing, and wash it off once they come indoors.
Safety During Pregnancy
EPA-registered repellent lotions, including those containing DEET, picaridin, and IR3535, are considered safe for use during pregnancy when applied as directed. The CDC specifically recommends that pregnant women in mosquito-prone areas use repellent, particularly given the risks of mosquito-borne illnesses like Zika and West Nile virus. The risk of not using repellent in high-exposure areas generally outweighs any theoretical concern about the ingredients.
Skin Reactions and Side Effects
Most people tolerate repellent lotions without problems, but reactions do occur. DEET can cause a warm or tingling sensation on sensitive skin, and at higher concentrations it may feel oily or dissolve certain synthetic fabrics and plastics. Picaridin causes skin irritation very rarely and is generally considered the gentlest synthetic option. If picaridin gets into your eyes, expect temporary irritation, so wash your hands after applying.
People with eczema or other skin conditions may find that any repellent lotion aggravates their symptoms. Testing a small amount on your inner forearm before full application is a practical way to check. If you notice redness, itching, or a rash, wash the area with soap and water and try a different active ingredient.
Getting the Most Out of Your Lotion
Apply repellent lotion only to exposed skin, not under clothing. Rub it in evenly rather than dabbing it in spots. Mosquitoes are opportunistic and will find any gap in coverage, so pay attention to ankles, the backs of hands, and the neck.
Reapplication timing depends on the product’s concentration and your activity level. Sweating, swimming, and toweling off all remove lotion faster. If you notice mosquitoes starting to land on treated skin, it’s time to reapply. Higher concentrations of active ingredient don’t repel mosquitoes more effectively than lower ones. They simply last longer before needing a fresh application.
When you head indoors, wash treated skin with soap and water. There’s no benefit to leaving repellent on longer than needed, and removing it reduces your overall chemical exposure, which is especially worthwhile for children.