CDC Recommended Mosquito Repellent | Four Key Ingredients

Nothing ruins an evening in the garden faster than mosquitoes finding you before you find the spray. When grabbing a CDC recommended mosquito repellent, the agency’s guidance is straightforward: check the active-ingredient list for one of four specific compounds the EPA has verified as both safe and effective. The rest of this guide covers what each ingredient does, how long it lasts, who should use it, and the application order the CDC says most people get wrong.

What Does the CDC Recommend for Mosquito Repellent?

The CDC endorses only EPA-registered insect repellents. That means the product has passed federal testing for safety and effectiveness against mosquitoes that carry West Nile virus, dengue, Zika, and other diseases. The four approved active ingredients are DEET, Picaridin, IR3535, and Oil of Lemon Eucalyptus (also called OLE or PMD). A fifth option, 2-Undecanone, is EPA-registered as an alternative but is not among the four the CDC highlights in its primary guidance. None of these are brand names — they are chemical active ingredients found in dozens of consumer products from companies like Sawyer, Ben’s, OFF!, and Cutter.

Products without EPA registration, including many essential-oil blends sold as “natural” repellents, have unknown effectiveness and are not recommended by the CDC.

CDC-Recommended Ingredients: How They Compare

Each of the four ingredients works differently and lasts for a different window of time. The table below shows the key differences so you can match the right one to your day outside.

How to Apply Mosquito Repellent Correctly

The CDC and the National Pesticide Information Center agree on a specific order and technique that most people skip. Applying repellent the wrong way is the most common reason it seems to fail.

1. Apply sunscreen first — spread it over all exposed skin and let it dry completely. Sunscreen needs direct contact with skin to work; repellent works fine on top.
2. Apply repellent second — spray or rub it over the sunscreen. The repellent does not reduce sunscreen’s effectiveness when applied this way.
3. For your face — never spray repellent directly onto your face. Spray it onto your hands first, then rub gently onto your forehead, cheeks, and chin. Avoid eyes and mouth.
4. Cover only exposed skin — do not apply repellent under clothing. Mosquitoes can bite through thin fabric, but the repellent should stay on the skin that’s actually visible.
5. Reapply only when needed — the CDC says to reapply only if you notice bites, are sweating heavily, or have been in water. Reapplying sooner than the label allows adds no benefit and increases chemical exposure.

For a full lineup of tested sprays and lotions you can buy today, see our product roundup on the best deterrent for mosquitoes — the same active ingredients in formats that work best for yard work, hiking, and daily wear.

Safety Rules by Age and Situation

The four CDC-recommended ingredients are safe for nearly everyone, but there are hard age cutoffs and one important exception. The wrong choice for a child can cause skin irritation or worse.

• Under 2 months old: No repellent of any kind. Use mosquito netting over carriers and strollers, and dress the baby in long sleeves and pants.
• 2 months to 3 years: DEET (up to 30% concentration), Picaridin, and IR3535 are all safe. The American Academy of Pediatrics recommends ≤30% DEET for children. Do not use Oil of Lemon Eucalyptus (OLE) on children under 3 — it can irritate their skin.
• 3 years and older: All four main ingredients plus 2-Undecanone are safe to use. Stick with ≤30% DEET for children; adults can use 20–50% DEET without issue.
• Pregnant or breastfeeding: All four EPA-registered repellents — DEET, Picaridin, IR3535, and OLE — are considered safe. Multiple CDC and EPA reviews have found no evidence of harm.

Permethrin is different. It is EPA-registered but never apply it to skin. The CDC says to use 0.5% permethrin only on clothing, tents, nets, and gear. It kills mosquitoes on contact and lasts through several washes.

Common Mistakes That Reduce Protection

Even with the right product, small errors cut your protection short. The CDC’s travel health guidance flags these as the most frequent problems it sees.

• Applying repellent before sunscreen — sunscreen needs bare skin; repellent on top still works. The reverse order reduces sunscreen’s effectiveness.
• Reapplying too soon — unless you are sweating or swimming, one application lasts hours. Reapplying early just adds chemicals without more protection.
• Using repellent on skin under clothing — this wastes product and can irritate skin. Mosquitoes rarely bite through thick fabric, and the repellent does not need to be there.
• Using non-EPA natural repellents — essential-oil blends not registered with the EPA have never been tested for effectiveness. The CDC explicitly advises against relying on them.
• Using OLE on children under 3 — Oil of Lemon Eucalyptus is plant-based, but it can cause skin reactions in young children. Stick with DEET or Picaridin for kids this age.
• Putting permethrin on skin — this is a clothing-and-gear treatment only. On skin it can cause burning and numbness.

Which Repellent Ingredient Lasts Longest?

Picaridin holds the duration record among the CDC-recommended ingredients. At 25% concentration it stays effective for up to 12 hours — long enough to cover a full workday in the yard without reapplying. At 20% concentration it lasts 9–10 hours. DEET at 20% or higher lasts 4–8 hours, depending on heat and sweat. OLE and low-concentration DEET (10%) both last about 2–4 hours, which is the shortest window among the four. IR3535 sits in the middle at 4–8 hours.

The takeaway: if you need all-day protection and dislike the feel of DEET, 20% Picaridin is the best balance of duration, comfort, and safety for most adults.

Quick Reference: Choosing the Right Repellent

Match the ingredient to your situation. For an afternoon in the yard with the kids, ≤30% DEET or 20% Picaridin covers everyone from age 2 months up. If you prefer a plant-based option and nobody in your group is under 3, OLE works for shorter sessions. For extended hikes or evenings near standing water, 25% Picaridin or 20%+ DEET gives you the longest coverage window. Stick with EPA-registered products and the sunscreen-first order, and you are following the CDC’s full published guidance.