Stopping bug bites comes down to three things: making yourself harder to find, putting effective barriers between your skin and insects, and reducing the number of biting insects around your home. Most people rely on just one of these strategies when combining all three is what actually works.
Why Bugs Find You in the First Place
Mosquitoes locate you through a layered detection system. From a distance, they follow the carbon dioxide in your breath. As they get closer, they pick up on body heat, humidity near your skin, and a cocktail of chemicals your skin naturally produces. The most important of these is lactic acid, which is the single most well-documented mosquito attractant from human skin. Lactic acid is produced by bacteria in the Staphylococci family living on your skin, and it works together with carbon dioxide and ammonia to trigger short-range attraction. Without lactic acid or ammonia present, other skin chemicals alone aren’t enough to draw mosquitoes in.
This is why some people genuinely do get bitten more than others. Your unique skin microbiome determines the specific blend of volatile compounds you emit. Exercise, sweat, and higher body temperature all amplify these signals. You can’t eliminate them entirely, but understanding them explains why repellents and barriers matter so much.
Color also plays a role. Research on mosquito visual preferences shows that dark stimuli are strongly preferred, and red and black are consistently attractive colors. Wavelengths in the green range (roughly 475 to 575 nanometers) tend to reduce mosquito interest under normal conditions. When human foot odor is present, though, mosquitoes become less picky and are attracted to objects across the entire color spectrum. So wearing lighter-colored clothing helps, but it’s not a standalone solution.
Which Repellents Actually Work
Not all repellents are created equal, and the active ingredient matters far more than the brand name. Four ingredients are registered by the EPA and recommended by the CDC for long-lasting protection: DEET, picaridin, IR3535, and oil of lemon eucalyptus (OLE). Here’s how they compare in practice:
- DEET (20-30%): The longest-studied option. A 40% formulation provides complete protection against mosquitoes for about 7 hours.
- Picaridin (20%): Performs comparably to 20% DEET against major mosquito species and protects for 8 to 14 hours. A 10% concentration lasts 3.5 to 8 hours. It’s odorless and doesn’t damage plastics or synthetic fabrics the way DEET can.
- IR3535 (20%): Offers 7 to 10 hours of protection against most mosquito species, though it drops to about 3.8 hours against certain types.
- Oil of lemon eucalyptus (30% PMD): The plant-derived option. At 30% concentration, it provides 4 to 6 hours of complete protection against mosquitoes and ticks. A field trial found that 32% lemon eucalyptus oil gave over 95% protection for 3 hours, compared to 100% protection for 7 hours from 40% DEET. Not recommended for children under 3.
Citronella-based products, by comparison, offer about 1 hour of protection at typical concentrations. If you’re spending real time outdoors, they’re not enough.
Pregnant and breastfeeding women can use all EPA-registered repellents. Follow the label directions for application.
What Doesn’t Work
Vitamin B1 (thiamine) has been promoted as a “natural” bug repellent you can take as a pill since 1943. A comprehensive review of 104 studies, case reports, and guidelines found no evidence that thiamine repels insects at any dosage or by any route of administration. The positive reports are almost entirely anecdotal, based on uncontrolled trials or using the absence of itchy welts as a stand-in for fewer bites. Controlled experiments measuring actual insect landing and feeding behavior found nothing. No insect bite prevention guideline published after the 1990s recommends it. Garlic supplements fall into the same category of unsupported claims.
The risk isn’t just wasted money. Relying on an ineffective repellent means you’re unprotected against mosquito-borne diseases like West Nile virus, Zika, and Eastern equine encephalitis.
Clothing as a Physical Barrier
Long sleeves, long pants, and closed-toe shoes create a simple physical barrier that works against mosquitoes, ticks, chiggers, and biting flies. Light-colored clothing is easier to inspect for ticks and is less attractive to mosquitoes based on their visual preferences for dark objects.
Permethrin-treated clothing takes this a step further. Permethrin is an insecticide applied to fabric that kills or repels insects on contact. In a study of outdoor workers, permethrin-treated uniforms reduced tick bites by more than 80% during the first year. The control group logged 780 tick bites over two seasons compared to 265 in the treated group, even though both groups used their usual prevention measures. Protection declined somewhat in the second year. You can buy pre-treated clothing or apply permethrin spray to your own gear. Permethrin is meant for fabric only, not skin.
Keeping Ticks Off You
Ticks hunt differently from mosquitoes. They don’t fly or jump. Instead, they “quest” by climbing to the tips of grass blades or low vegetation and waiting with their front legs outstretched to grab onto anything that brushes past. This means your prevention strategy is different too.
Walk in the center of trails and avoid brushing against vegetation at the edges. Tuck pants into socks when hiking through tall grass or leaf litter. After spending time outdoors, do a full-body tick check, paying special attention to your scalp, behind your ears, armpits, and groin. Showering within two hours of coming indoors helps wash off ticks that haven’t attached yet.
Around your yard, keep the lawn mowed to about three inches. Prune overhanging branches to let in sunlight, since ticks dry out quickly in open, sunny areas. Remove leaf litter and groundcover plants near areas where your family spends time. Place swing sets, patios, and play areas away from the wooded edge of your property. A three-foot border of mulch or gravel between your lawn and wooded areas serves as a visual reminder to stay out of tick habitat. Move bird feeders, firewood stacks, and garbage cans away from the house, since these attract wildlife that carries ticks into your yard. Deer fencing can help but won’t exclude smaller animals like mice and chipmunks that also transport ticks.
Reduce Mosquitoes Around Your Home
Female mosquitoes lay eggs directly on standing water, and it takes only 10 to 14 days for an egg to become a biting adult. Larvae can develop into pupae in as few as 5 days in the right conditions. Any container that holds water for more than a week is a potential breeding site.
Walk your property once a week and dump, drain, or cover anything that collects water. The usual suspects are flower pot saucers, clogged gutters, bird baths, old tires, buckets, tarps with pooled water, and toys left outside. Bird baths should be refreshed every few days. Rain barrels need tight-fitting mesh screens. Pool covers that sag and collect puddles are surprisingly productive mosquito nurseries.
Use Fans When You’re Sitting Outside
A simple electric fan is one of the most underrated tools for bite prevention. Mosquitoes are weak fliers, and moving air makes it harder for them to land on you. Just as importantly, fans disperse the plume of carbon dioxide and skin chemicals that mosquitoes follow to find you. Oscillating fans and box fans work best outdoors because they push air over a wider area. A small tabletop fan helps in a pinch but covers less ground. Position the fan to blow across the area where you’re sitting, angled slightly downward since mosquitoes often approach low.
Putting It All Together
The most effective approach layers multiple strategies. Apply a repellent with 20% or higher picaridin or DEET to exposed skin. Wear light-colored, long clothing treated with permethrin when you’ll be in heavy bug territory. Eliminate standing water on your property weekly. Keep your yard trimmed and sunny. Run a fan on the porch during evening hours when mosquitoes are most active. Do tick checks after time spent near wooded or grassy areas. None of these steps alone is perfect, but stacked together they make a dramatic difference in how many bites you bring home.