Does Borax Kill Bed Bugs? The Truth (2026 Guide)

✅ Reviewed by our prevention editors • Updated June 2026 • 11 min read

Borax is a common laundry and cleaning product sometimes suggested as a pest killer, so people ask: does borax kill bed bugs? The honest answer is no, not reliably. Borax can kill certain pests that ingest it (like ants), but bed bugs feed only on blood — they do not eat powders or baits — so the main way borax kills other insects does not apply to bed bugs. And as a sprinkled powder, borax does not reliably dehydrate bed bugs, reach their hidden harborages, or kill their eggs.

This is a key distinction that trips people up. Borax is genuinely effective against some pests because those pests eat it, but bed bugs are blood-feeders that will not consume a borax powder or bait. So the poisoning-by-ingestion route that makes borax work on ants and roaches simply does not exist for bed bugs. On top of that, borax has safety cautions and, like other sprinkled-powder remedies, cannot reach where bed bugs hide.

In this guide you will learn whether borax kills bed bugs, why the ingestion route does not apply, why it fails as a dust, safety concerns, and what actually works instead. We will use clear tables and finish with a printable checklist. 💚

Does Borax Kill Bed Bugs? Quick Answer

The quick answer is no — borax does not reliably kill bed bugs. Borax kills certain pests (like ants) by ingestion, when those pests eat it. But bed bugs feed only on blood; they do not eat powders or baits, so the ingestion route that makes borax work on other insects does not apply to bed bugs. And as a sprinkled powder, borax does not reliably dehydrate bed bugs, reach their hidden harborages, or kill their protected eggs.

So borax is not an effective bed bug treatment. It also carries safety cautions — it can be harmful if ingested or inhaled and should be kept away from children and pets. Relying on it wastes time while the infestation grows. The methods that genuinely work — heat, steam, encasements, interceptors, thorough treatment, and professional help — are where your effort belongs. Our guide on whether baking soda kills bed bugs covers a related powder myth.

No — borax kills pests that eat it, but bed bugs only drink blood, so it does not work on them. It also does not reach harborages or kill eggs, and it carries safety cautions. Use proven methods instead.

How Borax Kills Other Pests

Borax is genuinely effective against some pests, but it is important to understand how. For pests like ants (and to some extent cockroaches), borax works largely by ingestion: the pest eats the borax (often mixed into a sweet or food-based bait), and the borax disrupts its digestive system and kills it. This is why borax-based ant baits are a real, working pest-control method.

The key is that these pests consume the borax — they are attracted to and eat the bait, ingesting the toxic substance. Borax effectiveness against them depends entirely on this eating behavior. Without the pest ingesting it, borax would not kill them through a bait. So borax success against ants is fundamentally about getting them to eat it.

This is the crucial point for bed bugs: because borax works on other pests by being eaten, its effectiveness depends on the pest feeding habits. And bed bugs have feeding habits that make this route impossible, as the next section explains. So borax working on ants does not mean it works on bed bugs. Our guide on bed bugs vs other pests covers their different behaviors.

Bed Bugs Only Drink Blood

The decisive reason borax does not work on bed bugs is that bed bugs feed only on blood. Unlike ants or cockroaches, bed bugs do not eat food, crumbs, powders, or baits — they pierce skin and drink blood, and that is their only food source. So there is no way to get a bed bug to ingest borax through a bait, because they will not consume it.

This means the ingestion route that makes borax effective against eating pests simply does not exist for bed bugs. You cannot poison a bed bug by getting it to eat borax, because it never eats anything but blood. So the main mechanism behind borax pest-killing power is completely inapplicable to bed bugs.

This is the same reason food-based baits in general do not work on bed bugs (unlike for ants and roaches): there is nothing to bait them with, since they only want blood. Understanding that bed bugs are blood-only feeders explains why borax, and bait-based approaches generally, fail against them. Our guide on what attracts bed bugs covers their blood-only feeding.

Why It Fails as a Sprinkled Dust

Since bed bugs will not eat borax, the only other way it might work is as a sprinkled dust that contacts the bugs — but it fails there too. The idea would be that borax acts as a desiccant or abrasive on contact, drying out bugs that walk through it, similar to the (also false) salt and baking soda claims. But borax does not reliably work as a contact desiccant against bed bugs the way true desiccants do.

Borax does not have the specific microscopic properties of effective desiccant dusts like diatomaceous earth, so sprinkled borax does not dependably dry out or kill bed bugs that cross it. And bed bugs, walking over or around the powder, are not reliably affected. So the contact-dust route fails much as it does for baking soda and salt.

So neither route works: bed bugs will not eat borax (ruling out the ingestion route that kills other pests), and as a contact dust it does not reliably kill them (unlike true desiccants). This double failure is why borax is not a working bed bug treatment, despite its effectiveness against eating pests. Our guide on diatomaceous earth covers a real contact desiccant for contrast.

It Does Not Kill Eggs

Like other ineffective remedies, borax does nothing to kill bed bug eggs. The eggs are protected and resistant, cemented into hidden crevices, and sprinkled borax has no effect on them. So even setting aside its failure against adult bugs, borax leaves the eggs to hatch into a new generation, which alone would doom it as a solution.

Bed bug populations persist through their eggs, so any approach that does not kill eggs allows the infestation to continue, since the eggs hatch and the cycle restarts. Borax inability to affect eggs (or even reach them in their crevices) means it cannot break the reproductive cycle that keeps an infestation going.

So the egg problem is another decisive strike against borax. Effective treatments specifically account for eggs — heat kills them — whereas borax does not. This is part of why borax, even setting aside the feeding issue, cannot work as a standalone bed bug solution. Our guide on bed bug eggs covers their resilience.

It Does Not Reach Hidden Bugs

Borax, as a sprinkled powder, also cannot reach the bugs hidden in their harborages. Sprinkling borax on surfaces or along baseboards does not penetrate into the mattress seams, box spring interiors, frame joints, cracks, and crevices where bed bugs spend most of their time. So the bulk of the infestation is never contacted by the borax.

Bed bugs emerge at night from these protected spots to feed and return, largely avoiding open sprinkled areas, and even if they cross some borax, it does not reliably harm them. So the combination of not being eaten, not working reliably on contact, and not reaching the harborages means borax misses the infestation entirely.

This inability to reach harborages is a common failing of surface-applied remedies, and it is why methods that penetrate crevices (steam) or treat whole items and rooms (heat) are necessary. Borax offers no way to get to where the bugs live, on top of its other failures. Our guide on where bed bugs hide covers the hidden harborages.

Borax Myth vs Reality

Claim	Reality
Kills bed bugs by ingestion (like ants)	Bed bugs only drink blood — they will not eat it
Dehydrates bugs on contact	Not a reliable contact desiccant against bed bugs
Kills eggs	No effect on protected eggs
Reaches hidden bugs	No — stays on surfaces
Solves an infestation	No

Borax works on pests that eat it — bed bugs do not, so it does not work on them.

Borax Safety Cautions

Borax is not harmless, and safety is a real consideration. Borax can be harmful if ingested or inhaled, and can cause irritation, so sprinkling it around the home — especially where children and pets could contact, ingest, or breathe it — carries risks. Powdered borax spread on floors, beds, or surfaces is something to be cautious about in a household.

This means that even setting aside its ineffectiveness against bed bugs, dousing your home in borax powder is not a safe approach, particularly with children or pets present. Any use of borax should follow its label cautions and keep it away from children and pets. The safety concern is another reason not to rely on borax as a bed bug treatment.

So the combination of ineffectiveness (bed bugs will not eat it, and it fails as a contact dust) and safety risk makes borax a poor choice for bed bug control. For questions about borax safety, follow the product label and keep it away from children and pets. The safer, more effective path is the proven methods. Our guide on treatment safety covers using products responsibly.

What About Borax in Laundry?

Some people add borax to laundry and wonder if that helps against bed bugs in clothing. The reality is that any bed bugs killed during laundering are killed by the heat of the hot wash and especially the hot dryer, not by the borax. Borax is a laundry booster, but it is the high temperature that kills bed bugs and eggs in fabrics, just as in any hot laundering.

So adding borax to your wash does not provide a bed-bug-killing benefit beyond what the heat already does. You can launder infested items effectively by washing on the hottest setting the fabric allows and drying on high heat for a full cycle — the heat does the work, with or without borax. Do not rely on borax in the wash as a bed bug killer.

This mirrors the broader lesson that, in laundering, heat is the killer. If you use borax as a normal laundry additive, that is fine, but credit the heat — not the borax — for killing any bed bugs in your fabrics. The effective step is the hot wash and hot dry. Our guide on whether bed bugs survive the washing machine covers laundering.

The Risk of Relying on Borax

The main risk of borax is the same as with other ineffective remedies, plus the safety concern: wasted time while the infestation grows, and potential exposure risk. Sprinkling borax and waiting for results that will not come lets the hidden bugs keep feeding and the eggs keep hatching, allowing a small problem to become a large, entrenched one — while borax powder around the home poses a safety risk to children and pets.

Because bed bug infestations compound, delay is costly. A method that feels like action but does nothing real (since bed bugs will not eat it and it fails as a dust) provides false reassurance while the situation worsens out of sight. The weeks spent on borax are weeks the infestation uses to spread.

So the cost of relying on borax is lost time, a growing infestation, and a safety risk — with no benefit. The sensible course is to recognize early that borax will not work on bed bugs and pivot to proven methods. Catching and treating an infestation properly and early beats relying on a misapplied remedy. Our guide on why bed bugs are hard to get rid of covers the cost of delay.

What Actually Works Instead

What actually works are methods that reach harborages, kill all stages including eggs, and provide lasting effect — safely. Heat is highly effective — a hot dryer for fabrics, steam for seams and crevices, and professional heat treatment for whole rooms — killing bugs and eggs where borax cannot. Thorough vacuuming physically removes bugs and eggs.

Mattress encasements seal bugs in and protect the bed, and interceptors under bed and furniture legs monitor and capture bugs, providing the lasting effect borax lacks. You can view interceptor options on Amazon and protect the bed with a mattress encasement (see options on Amazon). For significant infestations, professional treatment is the most reliable route.

If you want a dust-based method, a true desiccant like diatomaceous earth (used properly and sparingly, ideally with guidance) is the effective choice for bed bugs, not borax — because it works on contact as a desiccant, not by being eaten. But the core of any successful approach is reaching the harborages, handling the eggs, and lasting over time. Our guide on how to get rid of bed bugs covers the full approach.

Borax vs Proven Methods

Method	Works on Bed Bugs?	Why
Borax	No	Bed bugs will not eat it; fails as a dust
Heat (dryer/steam/professional)	Yes	Kills bugs and eggs, reaches harborages
Thorough vacuuming	Yes (removal)	Physically removes bugs and eggs
Encasements	Yes (protection)	Traps bugs and protects the bed
Diatomaceous earth	Yes (contact desiccant)	Kills crossing bugs over time

Borax relies on being eaten — bed bugs only drink blood, so it does not work on them.

Common Mistakes (and Fixes)

• Mistake: Assuming borax kills bed bugs like it kills ants. Fix: ants eat it; bed bugs only drink blood, so the route does not apply.
• Mistake: Sprinkling borax as a contact dust. Fix: it does not reliably kill bed bugs on contact — use a true desiccant or heat.
• Mistake: Crediting borax in laundry for killing bugs. Fix: the heat kills them, not the borax.
• Mistake: Spreading borax around children and pets. Fix: it can be harmful if ingested or inhaled — keep it away from them.
• Mistake: Losing weeks on borax while the problem grows. Fix: switch to effective treatment early.

Expert Pro Tips

• Remember bed bugs only drink blood. Bait-and-ingestion methods like borax cannot work on them.
• Do not rely on borax as a contact dust. Use a true desiccant (diatomaceous earth) or heat.
• Credit the heat in laundry. Borax adds nothing against bed bugs; the heat kills them.
• Mind the safety risks. Keep borax away from children and pets.

Borax kills the pests that eat it — but bed bugs only drink blood, so there is nothing to poison. Add the dust failures and safety risks, and borax is the wrong tool for bed bugs.

Real-Life Scenarios

The ant-bait assumption. Sam had used borax successfully on ants and assumed it would work on bed bugs — but bed bugs never ate it, since they only drink blood. He switched to heat, steam, and interceptors, which worked.

The dust letdown. Lena sprinkled borax as a contact dust, but it did not reliably kill the bugs and did not reach the harborages. A true desiccant and heat treatment finally made progress.

The laundry mix-up. Tom added borax to his wash thinking it killed the bugs, but it was the hot dryer doing the work. He focused on the heat and skipped relying on the borax.

Frequently Asked Questions

Does borax kill bed bugs?

No, not reliably. Borax kills certain pests by ingestion, but bed bugs feed only on blood and will not eat it, so that route does not apply. As a sprinkled dust, borax also does not reliably dehydrate bed bugs, reach their harborages, or kill their eggs. It will not solve an infestation.

Why does borax work on ants but not bed bugs?

Because ants eat borax (often in a bait), ingesting the toxic substance, while bed bugs only drink blood and will not consume powders or baits. Borax effectiveness against eating pests depends on them eating it — a route that does not exist for blood-only bed bugs.

Can I sprinkle borax to kill bed bugs on contact?

It does not work reliably. Unlike true desiccants such as diatomaceous earth, borax does not have the properties to dependably dry out bed bugs on contact, and bed bugs walk over or around it. For a dust, use a true desiccant; for reliable killing, use heat.

Does adding borax to laundry kill bed bugs?

Any bed bugs killed in laundering are killed by the heat of the hot wash and dryer, not by the borax. Borax is a laundry booster, but the high temperature does the work. Wash on the hottest setting and dry on high heat — the heat kills the bugs, with or without borax.

Is borax safe to use around the house for bed bugs?

Borax can be harmful if ingested or inhaled and can cause irritation, so spreading it around the home — especially where children and pets are present — carries risks. Dousing your home in borax is both unsafe and ineffective against bed bugs. Keep it away from children and pets.

What should I use instead of borax?

Use methods that work on bed bugs: heat (a hot dryer, steam, professional heat), thorough vacuuming, mattress encasements, and interceptors for monitoring. For a dust, a true desiccant like diatomaceous earth (used properly) works on contact. For significant infestations, use a professional.

Final Verdict + Checklist

Does borax kill bed bugs? No — not reliably. Borax kills pests that eat it (like ants), but bed bugs feed only on blood and will not consume powders or baits, so the ingestion route that makes borax effective on other insects does not apply. As a sprinkled dust, borax also does not reliably dehydrate bed bugs, reach their hidden harborages, or kill their protected eggs, and it carries safety cautions (harmful if ingested or inhaled, keep from children and pets). Even in laundry, it is the heat — not the borax — that kills bugs. So skip borax for bed bugs and use proven methods: heat, steam, thorough vacuuming, encasements, interceptors, or a true desiccant like diatomaceous earth, with professional help for significant infestations.

This guide is educational and prevention-focused. It does not provide medical or safety advice; borax can be harmful if ingested or inhaled and should be kept from children and pets. For established infestations, consider a licensed professional. Some links may earn us a small commission at no extra cost to you.