In our full investigation into mosquito control, repellents came up as one of the most effective tools — but the wrong repellent for the wrong situation can leave you covered in bites and wondering why.

There are four EPA-registered active ingredients that actually work, dozens of products that use them, and a lot of marketing noise around each. This guide cuts through it: which ingredient does what, which product to buy for which situation, and how to use them properly.

The Four EPA-Registered Ingredients

The EPA evaluates and registers insect repellent active ingredients for safety and effectiveness. Only four are recommended by the CDC for protection against mosquitoes (CDC: Prevent Mosquito Bites). Here’s how they compare.

DEET — The Gold Standard

DEET has been the reference repellent since the 1950s. It’s the most studied, most proven, and most widely available.

  • How it works: Mosquitoes detect DEET on your skin and decide you’re not worth landing on. The exact mechanism is still debated — it may block the mosquito’s ability to sense you, or simply smell bad to them.
  • Protection time: 20–30% DEET provides about 6–8 hours of protection. 30% DEET is the practical ceiling for most people — higher concentrations (up to 100%) last slightly longer but feel greasier (RepellentInfo.org: DEET Prevention).
  • The downside: DEET melts synthetics — watch straps, sunglass frames, nylon tent floors, and certain rain jackets can be damaged on contact. It also has a strong smell and can feel oily.
  • Safety: The EPA has approved DEET for use on children with no age restriction, and the AAP and CDC recommend 10–30% DEET for children older than 2 months (EPA: Using Repellents Safely, HealthyChildren.org: Insect Repellents). Pregnant women can use DEET safely.

Verdict: Best for high-risk situations where you can’t afford a bite (backcountry, tropical travel). Not ideal for everyday use because of the smell and fabric damage.

Picaridin — The Best All-Around

Developed in the 1980s, picaridin is as effective as DEET without most of the downsides.

  • How it works: Similar mechanism to DEET — it interferes with the mosquito’s ability to detect you. The CDC and WHO both recommend it.
  • Protection time: 20% picaridin lasts 8–14 hours depending on conditions — generally matching or exceeding DEET at the same concentration (REI: Insect Repellent Guide).
  • The upside: No smell (or very little), doesn’t damage plastics or fabrics, feels light on skin. Many people who hate DEET switch to picaridin and never look back.
  • Safety: Excellent safety profile. The NIH notes picaridin has low toxicity and few adverse effects (PubMed: Picaridin Overview). The AAP considers it a good choice for children.

Verdict: The best choice for most people in most situations. Wirecutter has called it their top pick for years (Wirecutter: Best Bug Repellent), and WIRED’s 2026 review agrees (WIRED: Best Bug Sprays).

IR3535 — The Gentle Option

IR3535 is a synthetic version of a naturally occurring amino acid. It’s been used in Europe since the 1970s and in the US since the 1990s.

  • How it works: Less well understood than DEET or picaridin, but it appears to interfere with the mosquito’s olfactory receptors.
  • Protection time: Shorter than DEET or picaridin. Depending on concentration, expect 2–6 hours.
  • The upside: Extremely gentle on skin. Feels like a lotion. Found in Avon Skin So Soft Bug Guard and a few other products.
  • The downside: Shorter protection time means more frequent reapplication. Less effective in heavy mosquito pressure.

Verdict: Good for people with sensitive skin or very short outdoor exposure. Not the best choice for serious protection.

Oil of Lemon Eucalyptus (OLE) — The Plant-Based Option

OLE is a refined extract of the lemon eucalyptus tree. It is not the same as pure lemon eucalyptus essential oil — OLE is processed and tested for effectiveness, and it’s the only plant-based ingredient registered with the EPA as a mosquito repellent.

  • How it works: The active compound is PMD (p-menthane-3,8-diol), which repels mosquitoes through scent and taste.
  • Protection time: Comparable to low-concentration DEET — about 4–6 hours.
  • The upside: Plant-derived. Pleasant scent. DEET-free.
  • The downside: The CDC and AAP recommend against using OLE on children under 3 years old due to a lack of safety studies in that age group (EPA: Using Repellents Safely). Not as long-lasting as picaridin or higher-concentration DEET.

Verdict: A reasonable choice for adults who want a plant-based option for short outdoor activities. Not ideal for long days or heavy mosquito areas.

Which Ingredient for Which Situation

The right repellent depends on where you’re going, what you’re doing, and who’s wearing it.

Backyard / Light Duty (1–2 hours, low mosquito pressure)

Pick: Picaridin 20%

You’re grilling, sitting on the deck, or taking a short evening walk. Picaridin feels light, smells like nothing, and won’t damage your patio furniture. A single spray lasts through dinner. If you have sensitive skin, IR3535 is also fine for this duration.

Hiking / Camping (full day, moderate to heavy pressure)

Pick: DEET 30% or Picaridin 20%

Either works. DEET is marginally more proven in extreme conditions and may last slightly longer on heavy sweaters. Picaridin feels better and won’t damage your tent or rain jacket. If you’re treating your hiking clothes with permethrin (which you should — see the hub article), picaridin on exposed skin is a great combo.

Tropical Travel (disease risk areas)

Pick: DEET 30–50%

The CDC recommends DEET for travel to areas with mosquito-borne diseases like dengue, malaria, or Zika (CDC Yellow Book: Mosquitoes, Ticks & Other Arthropods). In these situations, the consequences of a bite outweigh the inconvenience of DEET. The World Health Organization notes that mosquito-borne diseases cause over 700,000 deaths globally each year (WHO: Vector-Borne Diseases) — protection matters. Pair with permethrin-treated clothing.

Children

Pick: Picaridin 10–20% or DEET 10–20%

The AAP and CDC recommend using insect repellents on children older than 2 months when needed (HealthyChildren.org: How to Choose an Insect Repellent). For infants under 2 months, use mosquito netting instead. For older children, picaridin is ideal because it has no smell and doesn’t feel greasy. DEET is also safe and effective at 10–20% concentrations. Do not use Oil of Lemon Eucalyptus on children under 3.

Sensitive Skin

Pick: Picaridin or IR3535

Both are well-tolerated and less likely to cause irritation. IR3535 is especially gentle — products like Avon Skin So Soft Bug Guard were specifically formulated for this use case. Patch test before full application.

Product Recommendations

These are specific products we’ve researched and can recommend for each situation. Prices are approximate and vary by retailer.

Sawyer Products 20% Picaridin Insect Repellent

  • Best for: The all-around best repellent for most people
  • Type: Pump spray, 3 oz or 6 oz
  • Price range: $8–12
  • Pro: Wirecutter’s top pick for years. No smell, doesn’t damage gear, long-lasting. The pump spray gives better coverage than aerosols.
  • Con: Small bottle runs out fast if you’re applying properly (a few full-body uses per bottle).
  • When to choose: This is your everyday repellent. Get this if you want one product for everything from backyard sitting to day hikes.
  • Check price on Amazon

OFF! Deep Woods Insect Repellent (25% DEET)

  • Best for: Heavy-duty protection when you can’t afford a bite
  • Type: Aerosol, 6 oz
  • Price range: $6–10
  • Pro: Up to 8 hours of protection. Widely available at any drugstore or big box retailer. Proven track record.
  • Con: Strong smell. Melts synthetics (watch out with sunglasses, watch straps, and some outdoor gear fabrics).
  • When to choose: Backcountry camping, tropical travel, or any situation where you need maximum protection and don’t care about smell or feel.
  • Check price on Amazon

Repel Plant-Based Lemon Eucalyptus Insect Repellent

  • Best for: Adults who want a plant-based option for short outdoor activities
  • Type: Pump spray, 4 oz
  • Price range: $8–12
  • Pro: DEET-free, pleasant lemon scent, made with Oil of Lemon Eucalyptus (EPA-registered). Up to 6 hours of protection.
  • Con: Not for kids under 3. Shorter protection than picaridin. Strong scent initially.
  • When to choose: Light backyard use, gardening, or short walks when you prefer a plant-based repellent.
  • Check price on Amazon

Ranger Ready Picaridin 20% Repellent

  • Best for: Premium pick — best feel and scent options
  • Type: Mist spray, 3.4 oz or 5 oz
  • Price range: $18–24
  • Pro: Excellent spray nozzle that delivers even coverage. Comes in unscented (Scent Zero) and light citrus options. 20% picaridin with additional tested effectiveness data. Doesn’t damage gear.
  • Con: More expensive than Sawyer. Smaller bottle per dollar.
  • When to choose: If the feel and smell of repellent bothers you, this is the most pleasant option. Good for daily use where you want protection without thinking about it.
  • Check price on Amazon

Ben’s 30% DEET Insect Repellent

  • Best for: Maximum protection, minimal price
  • Type: Pump spray or aerosol, 3.4 oz
  • Price range: $8–12
  • Pro: 30% DEET provides the longest protection before diminishing returns. Fragrance-free formula. Trusted by outdoor professionals.
  • Con: Same DEET downsides — smell, greasy feel, fabric damage. The pump spray version is better than the aerosol.
  • When to choose: You want the most protection for the lowest cost. Good for multi-day backcountry trips where you need one application to last.
  • Check price on Amazon

How to Apply Repellents Properly

Most people don’t use enough repellent. Here’s what you need to know.

Use Enough

A full-body application requires about a steady 4-second spray per limb. If you’re using a pump spray, you should see the skin glisten briefly before you rub it in. A light mist won’t cut it — mosquitoes will find the gaps.

Consumer Reports notes that many people under-apply and then blame the product (Consumer Reports: Repellent Ingredients Guide). A 3 oz bottle of picaridin should give you 2–3 full-body applications.

Common Mistakes

  • Don’t spray under clothing: Mosquitoes can bite through thin fabrics, but repellent is for exposed skin only. If you’re worried about mosquitoes biting through your shirt, treat your clothing with permethrin instead.
  • Don’t spray your face directly: Spray your hands first, then apply to your face. Avoid eyes and mouth.
  • Don’t spray cuts or wounds: Repellent is for intact skin only.
  • Don’t forget your ankles and feet: Mosquitoes are drawn to the carbon dioxide you exhale, which settles near the ground. Ankles and feet are prime biting targets.
  • Don’t use sunscreen-repellent combos: Sunscreen needs frequent reapplication; repellent does not. Combining them means either you don’t reapply sunscreen enough or you overapply repellent. Use separate products (CDC: Prevent Mosquito Bites).

Reapply When Needed

  • After swimming or heavy sweating: Water and sweat wash off repellent. Reapply immediately.
  • After 6–8 hours for DEET: 25–30% DEET is good for about 6–8 hours. If you’re still outside, reapply.
  • After 8–10 hours for picaridin: 20% picaridin lasts longer but still needs reapplication at the end of a long day.
  • After 2–4 hours for IR3535: Check the label — protection time varies by concentration.

The EPA maintains a repellent finder tool that shows registered products and their specific protection times.

After Coming Indoors

Wash treated skin with soap and water. Wash treated clothing before wearing again. This is especially important if you’re using repellent daily.

What About Natural Repellents?

If you’ve browsed the mosquito repellent aisle lately, you’ve seen plenty of “natural” options with essential oils like citronella, lemongrass, peppermint, cedar, and rosemary. Here’s the honest take.

The Short Answer

Essential oil-based repellents work — briefly. A 1996 study in the Journal of the American Mosquito Control Association found that citronella candles reduced bites by about 42% in still air (PubMed: Citronella candles study). That’s measurable but not reliable — especially in a breeze.

A comprehensive review in the Malaria Journal notes that while many plant-based repellents show some repellent activity, their short duration of protection (often under 1 hour) makes them impractical for most situations (PubMed: Plant-based insect repellents review).

What the CDC Says

The CDC does not recommend essential oil-based products as primary protection against mosquito-borne diseases. Their official guidance is to use an EPA-registered repellent (CDC: Prevent Mosquito Bites). The only plant-based ingredient they do recommend is Oil of Lemon Eucalyptus — because it’s EPA-registered, not because it’s natural.

When They Might Work

  • Sitting on a screened porch for 30 minutes during low mosquito hours
  • As a backup layer when combined with a fan (which is doing most of the work anyway)
  • When you’re okay with a few bites and just want something that smells nice

When They Won’t Work

  • Hiking in woods or tall grass
  • Sitting outside at dusk in a mosquito-heavy area
  • Any situation where mosquito-borne disease is a concern
  • Duration longer than 30–60 minutes

The bottom line: natural repellents are better than nothing, but not by much. If you’re serious about not getting bitten, use one of the EPA-registered ingredients above.

Safety Notes

These are based on current CDC, EPA, and AAP guidance.

  • DEET is safe for pregnant women — multiple studies have found no association between DEET use and adverse pregnancy outcomes (EPA: Using Repellents Safely).
  • DEET is safe for children over 2 months — the AAP recommends 10–30% DEET for children older than 2 months when needed. For infants under 2 months, use mosquito netting (HealthyChildren.org: Insect Repellents).
  • Oil of Lemon Eucalyptus is NOT for children under 3 — the EPA and CDC advise against OLE for this age group due to insufficient safety data.
  • Don’t use combination sunscreen-repellent products — the CDC specifically warns against them. Sunscreen needs reapplication every 2 hours; repellent doesn’t. Using a combo product means you’re either over-applying chemicals or under-protecting from the sun.
  • Wash repellent off at the end of the day — with soap and water, especially before sleeping.
  • Store repellents out of reach of children — like any household chemical. The National Pesticide Information Center has a detailed fact sheet on repellent safety (NPIC: Insect Repellents Fact Sheet).

Note: This is not medical advice. If you have specific health concerns about using insect repellents, consult with your healthcare provider. The AAP has a dedicated page on insect repellents for children (AAP: Insect Repellents).

The Bottom Line

If you want one repellent for everything, get Sawyer 20% Picaridin — it works as well as DEET, feels better, and doesn’t destroy your gear. If you’re traveling somewhere with mosquito-borne disease or heading deep into the backcountry, get OFF! Deep Woods (25% DEET) or Ben’s 30% DEET and use it without hesitation. If you want a plant-based option for short backyard use, Repel Lemon Eucalyptus is fine — just know its limits.

No repellent is 100% effective in all conditions. Combine it with the other strategies covered in our full mosquito control guide — fans, treated clothing, and eliminating standing water — for real protection.

This article is part of our mosquito control investigation. See also our guides on yard treatment, permethrin-treated clothing, and mosquito traps.