Every year, mosquitoes kill more humans than any other animal on Earth. And yet, picking the right repellent still confuses most people. DEET or picaridin? Is it safe during pregnancy? Can you bring it on a plane? This guide breaks down exactly what works, what’s safe for your family, and how to choose the best mosquito repellent for any situation.
Quick Answer
The most effective mosquito repellents contain one of four EPA-registered active ingredients:
- DEET (20-30%) – the gold standard, providing 6-8 hours of protection
- Picaridin (20%) – equally effective, odorless, and won’t damage plastics
- Oil of Lemon Eucalyptus (OLE) – the best plant-based option, CDC-recommended
- IR3535 (20%) – gentle formula used in Europe for decades
For most adults, a 25-30% DEET spray or 20% picaridin lotion offers the best balance of protection and comfort. For children under 3, stick with picaridin or IR3535 – never use OLE on kids under 3 years old.
Our Top Picks at a Glance
| Product | Active Ingredient | Best For | Protection Time | Price Range |
|---|---|---|---|---|
| OFF! Deep Woods Insect Repellent | 25% DEET | Overall best protection | 8 hours | $$ |
| Sawyer Products Picaridin Spray | 20% Picaridin | Best for sensitive skin | 12 hours | $$ |
| Repel Lemon Eucalyptus | 30% OLE | Best natural option | 6 hours | $ |
| Cutter Backwoods Dry | 25% DEET | Best budget pick | 8 hours | $ |
| Natrapel Tick & Insect Repellent | 20% Picaridin | Best for families | 12 hours | $$ |
| Thermacell E55 Rechargeable | Metofluthrin zone | Best area repellent | Continuous | $$$ |
OFF! Deep Woods Insect Repellent – Best Overall
There’s a reason OFF! Deep Woods has dominated the repellent market for years. Its 25% DEET formula provides up to 8 hours of protection against mosquitoes, ticks, gnats, and biting flies.
Key specs:
- Active ingredient: 25% DEET
- Protection time: up to 8 hours
- Format: aerosol spray (6 oz)
- Water-resistant: Yes
Pros: Proven effectiveness backed by decades of research. Works in high-mosquito environments including tropical regions. Available everywhere.
Cons: Strong chemical smell. Can damage synthetic fabrics and plastics. Feels greasy on skin.
Best for: Camping, hiking, and travel to mosquito-heavy areas. This is the repellent the CDC recommends for areas with mosquito-borne diseases like Zika and malaria.
Sawyer Products 20% Picaridin Spray – Best for Sensitive Skin
Picaridin matches DEET in effectiveness without the downsides. Sawyer’s formula feels like putting on a light moisturizer rather than a chemical shield. It won’t damage gear, clothing, or sunglasses – a common complaint with DEET products.
Key specs:
- Active ingredient: 20% Picaridin
- Protection time: up to 12 hours (mosquitoes), 8 hours (ticks)
- Format: pump spray (6 oz)
- Odorless and non-greasy
Pros: Longest protection time of any topical repellent. Won’t damage gear. Pleasant to wear. Safe for use on children over 2 months.
Cons: Slightly harder to find in stores than DEET products. Higher price per ounce.
Best for: Families with young children, people with sensitive skin, and anyone who hates the feel and smell of DEET. A 2020 study in the Journal of Medical Entomology confirmed 20% picaridin matches 25% DEET in mosquito repellency.
Repel Lemon Eucalyptus – Best Natural Option
If you want to avoid synthetic chemicals entirely, Repel Lemon Eucalyptus is the only plant-based repellent the CDC recommends for disease-carrying mosquitoes. The active ingredient, OLE (oil of lemon eucalyptus), is a refined extract – not the same as lemon eucalyptus essential oil.
Key specs:
- Active ingredient: 30% OLE (p-menthane-3,8-diol)
- Protection time: up to 6 hours
- Format: pump spray (4 oz)
- Plant-derived, DEET-free
Pros: Natural active ingredient. CDC-recommended. Pleasant citrus scent. Affordable.
Cons: Shorter protection time than DEET or picaridin. Cannot be used on children under 3 years old. Needs more frequent reapplication.
Best for: Adults who prefer natural products for everyday outdoor activities. Not suitable for infants or toddlers.
How Mosquito Repellent Actually Works
Most people spray repellent and never think about the science. But understanding how these chemicals work helps you use them more effectively.
DEET doesn’t kill mosquitoes. It scrambles their ability to detect the CO2 and lactic acid your skin releases. A mosquito flying toward you essentially becomes “blind” to your presence when DEET molecules surround your skin. Researchers at Rockefeller University demonstrated that DEET disrupts the insect’s olfactory receptors, making them unable to locate a blood meal.
Picaridin works similarly but through a slightly different mechanism. It creates a vapor barrier on the skin’s surface that mosquitoes actively avoid. Because picaridin evaporates more slowly than DEET, a 20% picaridin formula actually outlasts 25% DEET in most field tests.
OLE (oil of lemon eucalyptus) takes yet another approach. The active compound PMD mimics certain naturally occurring chemicals that signal “not food” to mosquitoes. It’s less potent than DEET or picaridin, which is why you need a higher concentration (30%) and more frequent application.
Safety: Pregnancy, Babies & Kids
One of the biggest concerns parents have is whether mosquito repellent is safe for their families. Here’s what the research says:
During Pregnancy
The EPA has classified DEET, picaridin, OLE, and IR3535 as safe for use during pregnancy when applied as directed. A large-scale study following pregnant women who used DEET found no increased risk of birth defects, low birth weight, or developmental problems.
The key precaution: apply repellent to clothing rather than skin when possible, and wash it off when you go indoors.
Babies Under 2 Months
No topical repellent should be used on infants under 2 months old. Instead, use a mosquito net draped over the stroller or carrier. After 2 months, picaridin and IR3535 are considered the safest options.
Children 2 Months to 3 Years
Use picaridin (20%) or IR3535. Apply it to your own hands first, then rub it onto the child’s exposed skin, avoiding hands, eyes, and mouth. Never let children apply repellent themselves. Do NOT use OLE products on children under 3.
Children Over 3 Years
All four EPA-registered ingredients are considered safe. DEET concentrations of 10-30% are appropriate. Higher concentrations don’t work better – they just last longer.
Flying With Mosquito Repellent: TSA Rules
Planning to bring repellent on a plane? Here are the rules:
Carry-on luggage: Repellent sprays and lotions must be in containers of 3.4 oz (100 ml) or smaller and fit in your quart-sized clear bag. Most travel-sized repellents meet this requirement.
Checked luggage: Full-sized repellent bottles are allowed in checked bags. Aerosol cans must have caps on and are limited to 18 oz (500 ml) per container, with a total of 70 oz (2 L) per passenger.
Pro tip: Buy repellent wipes for travel. They pack flat, meet TSA liquid rules easily, and are mess-free. Sawyer and Repel both make individually wrapped wipes that work well.
Buyer’s Guide: How to Choose the Right Repellent
Picking the right repellent comes down to four factors:
1. Where you’re going. Backyard barbecue? A 15% DEET or picaridin lotion works fine. Hiking in mosquito-heavy woods or traveling to tropical regions with malaria or dengue? Go with 25-30% DEET or 20% picaridin.
2. Who’s using it. For babies under 2 months, use nets only. For toddlers, picaridin or IR3535. For pregnant women, any EPA-registered repellent applied to clothing is safe.
3. How long you’ll be outside. A 7% DEET product lasts about 2 hours. A 25% DEET product lasts 8 hours. Match the concentration to your time outdoors.
4. What you’ll be doing. Swimming or sweating heavily? Choose a water-resistant formula or plan to reapply every 2 hours. Sitting on a patio? A Thermacell area repellent device eliminates the need for skin application entirely.
Common Mistakes to Avoid
- Spraying over sunscreen. Apply sunscreen first, wait 15 minutes, then apply repellent on top. Never use combo sunscreen-repellent products, since sunscreen needs reapplication every 2 hours but repellent doesn’t.
- Using essential oils as repellent. Citronella candles, lavender oil, and peppermint sprays have almost zero proven effectiveness against mosquitoes. A 2017 study in the Journal of Medical Entomology found most essential oil products provided less than 20 minutes of protection.
- Applying too little. Repellent needs to cover all exposed skin evenly. Most people under-apply by 50% or more.
- Forgetting ankles and feet. Mosquitoes often bite low. Don’t forget your feet, ankles, and the backs of your knees.
Key Takeaways
- DEET (20-30%) and picaridin (20%) are the two most effective repellent ingredients, both backed by decades of research and recommended by the CDC.
- For children under 3, use picaridin or IR3535. Never use OLE-based products on kids under 3 years old.
- All EPA-registered repellents (DEET, picaridin, OLE, IR3535) are safe during pregnancy when used as directed.
- Higher DEET percentages don’t repel better – they just last longer. 30% DEET gives about 8 hours of protection.
- Essential oil repellents (citronella, lavender) don’t work. Stick with EPA-registered ingredients for real protection.
- When flying, pack travel-sized repellent (under 3.4 oz) in your carry-on or full-sized bottles in checked luggage.
