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Choose an EPA-registered, skin-applied repellent whose current label covers mosquitoes and lists enough protection time for your planned exposure. The active ingredient alone does not guarantee a fixed duration. Compare the product’s EPA registration number, mosquito claim, protection-time statement, application directions, and age precautions. EPA-registered choices include DEET, picaridin, IR3535, oil of lemon eucalyptus, PMD, and other active ingredients.
What to look for first
Start with the product, not a generic ingredient ranking. Find the EPA Reg. No. on the package and read the current EPA-approved label. Confirm five things before buying:
- The product is registered, rather than merely marketed as “natural” or “plant-based.”
- The label covers mosquitoes and, when relevant, the mosquito concern for your area or activity.
- The stated protection time matches how long you expect to be outdoors.
- The application method fits your setting: exposed skin, clothing, or an outdoor area.
- The label permits use by everyone who will apply it, including children.
EPA’s selection questions are practical: do you need protection from mosquitoes, ticks, or both; how long will exposure last; and do you prefer a particular active ingredient? Those questions are more reliable than assuming one ingredient is always “best.”
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Most skin-applied insect repellents must be registered with the U.S. Environmental Protection Agency before they are marketed. Registration means EPA evaluated the product for human safety and effectiveness when it is used exactly as its label directs. The registration applies to that formulation and label, not to every product containing the same ingredient.
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Check the EPA Reg. No. printed on the container. EPA’s product finder is a useful way to understand available formulations, but EPA does not endorse products listed there. Its underlying database is dated June 2019, even though the selection page was updated later, so use the current package label for a product’s status, claims, and numeric duration.
Registered versus exempt products
Some products are exempt from registration because their ingredients were judged to pose minimal human-health risk at the concentrations marketed. EPA says those exempt products have not been evaluated for effectiveness. “Natural,” “botanical,” or “exempt” therefore does not mean proven mosquito protection.
A product that is not registered and does not qualify for an exemption may be illegal to sell. If dependable protection matters, choose a product carrying an EPA registration number and follow its label.
DEET, picaridin, IR3535, oil of lemon eucalyptus, and PMD
EPA lists several active ingredients in registered skin-applied repellents. The agency’s ingredient page establishes that these options are available; it does not establish a universal performance order among them.
| Active ingredient or category | What the EPA listing establishes | How to compare products |
|---|---|---|
| DEET | More than 500 products were listed on EPA’s page last updated in 2026. This is an approximate product count, not a performance score. | Read the individual label for mosquito claims, protection time, application limits, and child-use wording. |
| Picaridin | About 40 products were listed on the same EPA ingredient page. The count can change. | Compare the registered formulation and its label duration rather than assuming all picaridin products last equally long. |
| IR3535 | About 45 products were listed. The figure is an approximate current-page count. | Verify that the label covers mosquitoes and fits your exposure period. |
| Oil of lemon eucalyptus | Six products were listed on EPA’s page. The count is not a ranking. | Check the exact age restrictions and protection-time statement on the label. |
| PMD | PMD is among the active ingredients EPA identifies in registered repellents. | Use the registered product’s label; do not transfer claims from another PMD formulation. |
| Other EPA-listed actives | EPA’s list includes additional registered active ingredients. | Apply the same checks: registration number, mosquito claim, duration, directions, and age language. |
The counts above come from EPA’s ingredient listing, last updated in 2026, and may change. They indicate how many products appear in the listing, not which ingredient is most effective.
Why ingredient concentration is not a universal timer
Protection time belongs to the labeled product under specified test conditions. EPA notes that results can differ because of perspiration, water, temperature, test methods, and individual differences. Consequently, two products with the same active ingredient—or even similar concentrations—should not be treated as interchangeable timers.
EPA’s selection tool provides product-specific protection-time information and warns that test conditions differ. No current, directly comparable ingredient-level duration statistic is established for all DEET, picaridin, IR3535, oil-of-lemon-eucalyptus, or PMD products. If you need a numeric duration, use the current label for the exact formulation you are considering.
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Match duration to the outing
- Short exposure: A label duration that covers the planned walk or errand may be sufficient; do not reapply early unless the label permits or conditions require it.
- Long exposure: Choose a product whose labeled protection time covers the activity, and carry it for label-directed reapplication.
- Heat, exercise, or water: Perspiration, swimming, rain, and high temperatures can change real-world performance. Follow the label’s reapplication instructions instead of relying on the original time estimate.
- Variable conditions: Individual skin differences and mosquito pressure can affect results, so treat the label duration as a tested product claim, not a guarantee for every person.
How to read a repellent label before buying
The front of a package may emphasize an ingredient or a percentage, but the legally important details are on the EPA-approved label. Locate the EPA Reg. No., then check the directions panel or linked label for the intended sites of application, mosquitoes named as pests, maximum frequency, and any special warnings. A spray, lotion, wipe, or treated-clothing product can have different instructions even when the active ingredient is identical.
Look for a protection-time statement tied to a specific use. If a label gives separate times for different mosquito species, activities, or concentrations, use the statement that matches your situation rather than the longest number shown elsewhere on the package. Check whether the product is intended for skin, clothing, or both. Never assume that a product meant for fabric can be applied directly to skin, or that a skin product can be sprayed on clothing unless the label says so.
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Check the expiration or storage information when provided, especially for an old container kept in a hot car or shed. If the current package wording conflicts with an online listing, follow the current package label and verify the registration number with EPA or the manufacturer.
How to choose a product step by step
- Define the pest. Decide whether you need mosquitoes only or mosquitoes and ticks. Confirm the product’s accepted label claim. EPA says accepted claims support expected repellency against Aedes aegypti or Aedes albopictus when the label says it protects against mosquitoes generally or specifically against Aedes.
- Estimate exposure. Write down the likely time outdoors, including travel, setup, breaks, and the trip home. Select a labeled protection time that fits that period.
- Choose an active ingredient you will use correctly. DEET, picaridin, IR3535, oil of lemon eucalyptus, PMD, and other EPA-listed actives are legitimate categories. Preference is reasonable, but it should not replace checking the product label.
- Check the EPA Reg. No. Look for the registration number on the package. Do not confuse an ingredient name, a marketing claim, or an exemption statement with EPA registration.
- Read application directions. Determine whether the product is for exposed skin, clothing, or both; whether it must be reapplied after water exposure; and which areas must be avoided.
- Check age and user restrictions. Review child-specific language and any restrictions for pregnancy, sensitive skin, or other users stated on the label. The product label controls.
- Plan other controls. Repellent works alongside screens, protective clothing, avoidance of heavily infested areas, and removal of standing water.
DEET versus picaridin: a useful way to decide
Both DEET and picaridin are represented in EPA-registered products. EPA’s pages do not support declaring one universally superior. A better comparison is label against label.
| Decision question | What to check on a DEET product | What to check on a picaridin product |
|---|---|---|
| Is it registered? | Find the product’s EPA Reg. No. | Find the product’s EPA Reg. No. |
| Does it cover my pest? | Read the mosquito and any tick claims. | Read the mosquito and any tick claims. |
| How long will it work? | Use that formulation’s labeled protection time; do not import a duration from another DEET product. | Use that formulation’s labeled protection time; do not import a duration from another picaridin product. |
| Can my household use it? | Follow the label. EPA guidance states DEET has no age restriction, but all directions still apply. | Follow the individual label’s age and application directions. |
| Will I apply it correctly? | Check exposed-skin, clothing, spray, and reapplication instructions. | Check exposed-skin, clothing, spray, and reapplication instructions. |
If two products meet your needs, choose the one whose directions you can follow consistently and whose labeled duration fits the outing. That is a more defensible choice than treating the ingredient name as a guarantee. Packaging format can also affect compliance: a lotion, pump spray, or wipe may be easier for one person to apply evenly than another, but the format never overrides the label.
Oil of lemon eucalyptus and PMD: important age wording
Some oil-of-lemon-eucalyptus product labels restrict use in children under three. EPA describes an exception for certain products with oil of lemon eucalyptus as the sole active ingredient at concentrations of 30% or less, but the individual label remains controlling. Do not infer permission from an ingredient list alone; read the package directions for the exact product.
PMD is also listed among registered active ingredients. Because formulations and labels differ, use the same registration, mosquito-claim, duration, and age checks applied to every other option.
Safe application on skin and clothing
Read and follow the current product label every time. EPA’s general guidance includes these practices:
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- Apply only to exposed skin and/or clothing when the label directs; never put repellent under clothing.
- Avoid the eyes and mouth. Do not spray directly onto the face; spray onto hands first if the label allows facial application.
- Do not apply to cuts, wounds, or irritated skin.
- Avoid breathing spray and do not spray in enclosed spaces.
- Wash treated skin and clothing after returning indoors.
- Do not use a skin product on pets unless its label specifically says it is for animals.
- Reapply only as directed. Water, perspiration, and other conditions may require label-directed reapplication.
Applying repellent to children
Adults should apply repellent to their own hands and then spread it on the child. Do not apply repellent to a child’s hands, because children can put their hands in their eyes or mouth. Keep the product away from the eyes and mouth, and wash treated skin and clothing after coming indoors.
EPA guidance says DEET is approved for children without an age restriction. That does not remove the need to follow the specific product label. Oil-of-lemon-eucalyptus labels may include under-three restrictions, and other formulations can have their own wording.
When water, sweat, and clothing change the decision
Plan the application around the actual activity. For a hike, include the drive, trailhead, and rest stops in your exposure estimate. For a backyard event, consider whether people will sweat, swim, or repeatedly towel off. For a fishing or boating trip, water exposure and wind can make label-directed reapplication especially important. Do not solve these conditions by applying extra product more frequently than permitted; select a formulation whose directions address the setting.
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Long sleeves and pants reduce the amount of exposed skin that needs product. Apply repellent only to the exposed areas the label allows, and do not use a skin product under clothing. If clothing itself is treated, follow the separate clothing directions and laundering instructions on that product’s label.
Skin-applied products versus area or spatial repellents
Skin-applied repellents travel with the person wearing them. Spatial repellents instead disperse an active ingredient through an area. They can be useful for outdoor area protection, but the label determines the covered space, wind limitations, placement, duration, and whether the product is intended for a particular setting.
A device positioned on a patio may not protect a moving group, a windy campsite, or an area larger than its labeled coverage. Check whether people must remain within a defined treated zone and whether the device requires ventilation, a particular height, or separation from food and combustible materials. Registration or exemption status and the label’s safety directions matter for area products just as they do for skin-applied products.
Do not substitute sound-wave devices for a registered repellent on the assumption that an unverified signal is proven mosquito protection. For any area device, check its registration or exemption status and read the label’s coverage and safety directions.
Use repellent as part of mosquito control
A repellent reduces contact with mosquitoes but is not the only preventive measure. EPA also points to:
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- Light-colored long sleeves and long pants when practical.
- Avoiding places and times with heavy mosquito activity.
- Removing standing water where mosquitoes can breed, including containers, buckets, and other items around the home.
Layering these measures is especially important where mosquitoes may transmit disease. EPA states that a registered repellent can be expected to repel Aedes aegypti or Aedes albopictus when the accepted label says it protects against mosquitoes generally or specifically against Aedes. A repellent does not replace screens, clothing, or source reduction.
Common buying mistakes and fixes
Choosing by ingredient name alone
Problem: Assuming every product with a familiar active ingredient lasts the same length of time.
Fix: Compare the exact product label, including protection time, concentration, application method, and reapplication directions.
Treating “natural” as tested
Problem: Assuming an exempt product has EPA-verified effectiveness.
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Fix: Look for an EPA Reg. No. and understand that exempt products have not been evaluated by EPA for effectiveness.
Ignoring the pest claim
Problem: Buying a product without confirming that mosquitoes are on the label, or assuming a tick claim automatically covers every mosquito concern.
Fix: Read the accepted mosquito claim and any species-specific wording.
Using an old online duration
Problem: Relying on a marketplace description or an older product-finder record instead of the current package.
Fix: The EPA selection page was updated January 29, 2026, but its linked database is dated June 2019. Verify the current label and registration number for the product you are actually purchasing.
Applying more often than directed
Problem: Reapplying on a personal schedule that ignores label limits.
Fix: Follow the label, especially after swimming, sweating, or toweling off.
Using a skin product on animals
Problem: Applying a human repellent to a pet.
Fix: Use it on animals only when the label explicitly permits that use.
A compact decision checklist
- What needs protection: mosquitoes, ticks, or both?
- How long will exposure last?
- Does the label cover mosquitoes and the relevant Aedes claim, if needed?
- What is the EPA Reg. No.?
- What protection time does this exact formulation state?
- Will heat, water, or sweating affect the activity?
- Can every intended user follow the age and application directions?
- Is the product for skin, clothing, or an outdoor area?
- What screens, clothing, and standing-water controls will be used with it?
Bottom line for choosing DEET, picaridin, or another option
Buy the EPA-registered product whose label matches your mosquito exposure, not the ingredient with the strongest reputation. DEET, picaridin, IR3535, oil of lemon eucalyptus, PMD, and other EPA-listed actives can all be legitimate choices when used according to their labels. Verify the EPA Reg. No., mosquito claim, product-specific protection time, application directions, and age wording. Because test conditions and real-world conditions vary, there is no universal duration or ingredient ranking that replaces the current label.
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Frequently Asked Questions
What does EPA-registered mean for mosquito repellent?
It means EPA evaluated that specific formulation for human safety and effectiveness when used according to its approved label. Registration does not mean EPA endorses the product, and it does not automatically apply to every product using the same active ingredient.
Is DEET better than picaridin?
EPA’s ingredient listings do not establish a universal winner. Compare a current DEET label with a current picaridin label for mosquito claims, protection time, application method, age wording, and directions you can follow consistently.
How long does mosquito repellent last?
There is no single duration for an ingredient. Use the protection-time statement on the exact registered product label. Perspiration, water, temperature, test conditions, and individual differences can change real-world performance.
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Not necessarily. EPA says exempt products have not been evaluated by the agency for effectiveness. A botanical or natural description is not a substitute for checking an EPA registration number and a mosquito claim.
Can children use DEET?
EPA guidance says DEET is approved for children without an age restriction, but the individual product label still controls. Adults should apply repellent to their own hands first and then to the child, never on the child’s hands.
Can children under three use oil of lemon eucalyptus?
Some oil-of-lemon-eucalyptus labels restrict use under age three. EPA describes an exception for certain sole-active-ingredient products at concentrations of 30% or less, but you must follow the exact product label.
Can I use human mosquito repellent on my dog or cat?
Only if the product label specifically says it is intended for animals and gives animal-use directions. Do not apply a human skin repellent to a pet by assumption.
Do mosquito repellent sound devices work?
Do not treat sound-wave devices as proven substitutes for registered repellents. For an area or spatial device, check its registration or exemption status, labeled coverage, setting limits, and safety directions.
Where do I find the EPA registration number?
Look for “EPA Reg. No.” on the package, usually near the directions or other regulatory information. Use that number and the current package label to verify the product rather than relying only on an ingredient name or marketplace listing.
The Bottom Line
Choose by the exact EPA-registered label: confirm the EPA Reg. No., mosquito claim, product-specific protection time, application directions, and age restrictions. DEET, picaridin, IR3535, oil of lemon eucalyptus, and PMD are all available in registered products, but no ingredient name guarantees a fixed duration or universal superiority.
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