Best Mosquito Repellents UK 2026

A long day outdoors in Britain rarely ends in a dramatic injury — it ends in a cluster of itchy, swollen bumps on the ankles. Mosquito bites are almost entirely preventable, and the difference between a comfortable evening and a sleepless, scratching one usually comes down to a bottle you should have bought before you left the house. Repellent applied properly does far more for you than any cream applied afterwards, and the UK shelf is full of products whose active ingredients behave in very different ways — plus a handful that do not work at all.

This guide covers the repellents worth buying in the UK for 2026, what to do once you have been bitten, and the practical rules that labels do not always spell out: age limits, pregnancy guidance, and which actives will quietly destroy your watch strap. It is built from manufacturer specification sheets and product labels, guidance from the NHS and the UK Health Security Agency (UKHSA), published repellent-efficacy research, and the aggregated consensus of owner reviews on Amazon UK, Cotswold Outdoor customer feedback and outdoor forums including Reddit’s camping and wild-camping communities.

Affiliate disclosure: this guide contains affiliate links. If you buy through them, we may earn a commission at no extra cost to you. UK advertising rules (the ASA/CAP code) require us to make this clear, and it does not change what we recommend.

Quick picks at a glance

How to choose a mosquito repellent in the UK

Four active ingredients do the real work on UK shelves: DEET, icaridin (also sold as picaridin), PMD in its various forms, and IR3535. They are not ranked in a single league table. UKHSA and the NHS list DEET alongside icaridin as recommended actives, with neither placed above the other — so the common habit of calling DEET “first-line” protection is not how UK guidance frames it. What matters is matching the active and its concentration to your situation, and knowing what each one does to your kit.

Repellents do not kill insects. They interfere with the mosquito’s ability to detect the cues that tell it human skin is nearby, which is why coverage matters as much as chemistry: a perfect active smeared in three patches leaves an easy landing zone.

DEET: effective, well documented, demanding on your gear

DEET is the benchmark most people can name, and concentration is the variable that matters. UK products commonly sit in the roughly 20% to 50% range, and the general principle is that a higher concentration extends how long protection lasts rather than adding raw strength at the moment of application — which is why a 50% product is aimed at long days and high-risk travel rather than a short walk.

Two points of UK-specific detail are worth getting straight. First, much of the widely circulated “20% or more” framing originates in US guidance from the CDC; for a UK audience, UKHSA is the reference to follow. Second, there is an age floor: the NHS says to avoid DEET on infants under two months.

The trade-offs are the ones owner reviews complain about most. DEET has a distinct smell, can feel greasy on warm skin, and — the recurring theme in camping forums — damages plastics, watch crystals, sunglasses coatings and some synthetic fabrics. Keep it away from your tent’s groundsheet and your GPS screen, and wash your hands after applying.

Icaridin (picaridin): the DEET-free active UK guidance recognises

Icaridin is recognised by UKHSA and is the modern alternative for anyone who wants protection without the material damage. Its headline advantage is compatibility: icaridin is safe on plastics and synthetics, so it will not cloud a watch crystal, strip a sunglasses coating or mark a tent fabric — the single clearest differentiator against DEET.

At a 20% concentration, icaridin reaches the threshold at which published efficacy data shows protection comparable to DEET. That data includes the Smidge/Saltidin efficacy work from Bayer, the company that holds the Saltidin patent — Saltidin being the trade name for icaridin that appears on the Smidge bottle. Critically for UK buyers, that 20% figure covers both mosquitoes and UK Culicoides midges, so one bottle handles both problems. Higher concentrations cost more; a 20% product is the sensible default.

PMD, oil of lemon eucalyptus and Citriodiol are three different things

These three terms get used interchangeably in reviews, and they should not be:

• Oil of lemon eucalyptus is a crude botanical extract. Its PMD content varies from batch to batch, which makes real-world efficacy hard to predict.
• PMD (para-menthane-3,8-diol) is the refined active — synthetic or semi-synthetic — and the form that appears on a label with a stated percentage.
• Citriodiol is a trademarked, PMD-rich extract produced by Citrefine International Ltd, a UK company, and it is the active in the Mosi-guard Natural range. Citrefine’s own specification sheet is the reference point for its PMD content.

The practical upshot: a product that states a PMD or Citriodiol percentage tells you what you are buying. One that says only “oil of lemon eucalyptus” does not.

IR3535: real, but with the weakest evidence base of the four

IR3535 is the active in Avon Skin So Soft Bug Guard. Note the “Bug Guard” — the plain Skin So Soft bath oil, which circulates online as a midge repellent, is a different product with no proven repellent efficacy. Concentrations in consumer products typically sit around 10–20%, and at equivalent concentrations the evidence base for IR3535 is weaker than for DEET or icaridin — a point made in repellent-efficacy reviews such as the work by Goodyer and colleagues, published in the travel-medicine literature. It is a reasonable light, everyday option; it is not the bottle to rely on at dusk in the Highlands.

Mosquitoes and midges are not the same problem

UK biting insects split into two groups with genuinely different behaviour. Mosquitoes — Culex and Aedes — and biting midges, Culicoides, differ in seasonality and in how their bites present, so the calendar and the symptoms are not interchangeable. This is why a product that covers both, like 20% icaridin, is the default recommendation for UK conditions. For any UK species or risk claim, the reference point is UKHSA’s annual mosquito surveillance report, which sets out what is being recorded and where; the most recent edition is the one worth checking before you plan a trip or a summer of camping.

The best mosquito repellents for the UK in 2026

Lifesystems Expedition 50 — best all-round repellent

Best for: high-risk travel, long days outdoors, and anyone who wants maximum protection duration from a single bottle.

Key specification: 50% DEET in a pump spray format. Concentrations in that bracket extend how long protection lasts rather than making the repellent hit harder on application.

Standout strength: it sits at the top of the range UK guidance covers, and DEET’s evidence base is the most thoroughly documented of any active on this list. If you are travelling somewhere with genuine mosquito-borne disease risk, or spending a full day on the water, this is the bottle that removes the guesswork. A pump spray also lets you apply without touching the active with your hands.

Honest caveat: everything that makes DEET effective also makes it awkward. It smells, it can feel greasy, and it will damage plastics, watch crystals, sunglasses coatings and some synthetic fabrics — so it is a poor companion for a bare wrist wearing a sports watch, and it needs care around tent groundsheets and GPS screens.

Where to buy: Cotswold Outdoor and Amazon UK, typically around £8–£10.

Verdict: the most reliable single bottle for high-risk travel, provided you accept the material caveats.

Smidge That Midge — best DEET-free option for UK conditions

Best for: Scottish trips, midge season, and anyone whose gear or skin rules out DEET.

Key specification: 20% icaridin, sold under the name Saltidin on the label, in a pump spray. That 20% figure is the threshold at which published Bayer Saltidin efficacy data shows protection comparable to DEET against mosquitoes and against UK Culicoides midges.

Standout strength: material compatibility. Icaridin is safe on plastics and synthetics, so it will not damage watch crystals, sunglasses coatings or synthetic fabrics — the key differentiator against DEET, and the reason it has become the Highlands default for people who care about their kit.

Honest caveat: it is the priciest of the three headline sprays here, typically around £9–£11, and as a pump spray it rewards careful, even coverage. Patchy application is where any repellent fails.

Where to buy: Smidge direct, Boots and Amazon UK.

Verdict: the best all-round choice for UK conditions if you want one bottle for both mosquitoes and midges.

Mosi-guard Natural — best plant-derived option

Best for: buyers who prefer a plant-derived active but still want a stated, verifiable concentration.

Key specification: approximately 30% Citriodiol in a spray format. Citriodiol is the trademarked PMD-rich extract from Citrefine International Ltd, a UK company — and the Citrefine specification sheet is where its PMD content is documented.

Standout strength: a clearly stated active and percentage. That sounds like a low bar, but it is exactly what most “natural” repellents fail to provide — as covered above, oil of lemon eucalyptus products often list no PMD figure at all. A ~30% Citriodiol product tells you what you are getting.

Honest caveat: spray formats in general reward thorough coverage, and the word “natural” on a bottle has no regulatory meaning — the number on the back is what counts.

Where to buy: Boots and Amazon UK, typically around £8–£10.

Verdict: the sensible plant-derived pick, because the active and its concentration are documented.

Avon Skin So Soft Bug Guard — best light everyday option

Best for: everyday use where biting pressure is low, and anyone who dislikes the feel or smell of DEET.

Key specification: IR3535, available as a spray or lotion. Concentrations in consumer products typically sit around 10–20%.

Standout strength: the lighter, less obtrusive format. A lotion option in particular suits people who find DEET unpleasant on warm skin, and it is convenient for a garden or a short walk rather than a full expedition.

Honest caveat: as covered above, IR3535’s evidence base is weaker than DEET’s or icaridin’s at equivalent concentrations. It is also important to buy Bug Guard specifically — the plain Skin So Soft bath oil has no proven repellent efficacy, however often it is recommended on forums.

Where to buy: Avon direct and Amazon UK. Avon pricing moves with its own promotions, so check the current price on the Avon site.

Verdict: a pleasant everyday repellent, just not the one to bet a midge-heavy evening on.

Mosquito bites: what is happening and how to treat them

When a mosquito bites, it pierces the skin with its proboscis and releases saliva into the wound. According to the Wyndly care team’s 2025 clinical overview of mosquito bite allergy, that saliva contains proteins that provoke an immune response, and the body releases histamine to fight them — which is what causes the surrounding tissue to swell and itch.

For most people that means a small, raised, irritating bump that settles within a few days. A minority react far more strongly. Wyndly notes that a genuine mosquito bite allergy can present as larger areas of swelling, hives at or around the bite site, blistering lesions and, in some cases, fever, with anaphylaxis possible in severe cases — and that diagnosis should come from a healthcare professional rather than self-assessment.

Two practical consequences follow. First, reducing the number of bites is a matter of repellent chemistry and coverage, not willpower. Second, the itch is worth treating properly, because scratching breaks the skin and secondary bacterial infection is a real risk with unwashed hands in a damp tent.

After-bite treatments

Anthisan contains mepyramine maleate 2%, a pharmacy-standard antihistamine cream, and has been the default answer to a bite for decades. It has, however, seen UK supply disruption, so confirm current stock before you rely on it being on the shelf.

If it is not there, these are the live alternatives:

• Boots own-brand antihistamine cream — the same class of active, sold under the pharmacy’s own label and the direct substitute if Anthisan is out of stock.
• Hydrocortisone 1% — available as Boots or Superdrug own-brand, this is a mild topical steroid aimed at the inflammatory swelling rather than the histamine itch, so it suits bites that have puffed up significantly.
• Eurax HC cream — another live counter alternative when the shelves are picked over.

Treat these as symptomatic relief, not prevention. A cream applied after the fact does not reduce how many times you get bitten.

Pregnancy, babies and young children

The NHS advises that DEET is generally considered safe in pregnancy, but use should be minimised — apply only where and when you actually need it, and follow the label. Icaridin is treated similarly on NHS guidance. The NHS pages on insect bites and repellent use are the direct reference here, and they are worth reading in full if you are making the decision for a household rather than just yourself.

For infants, the age floor is explicit: the NHS says to avoid DEET on infants under two months. Beyond that, match the product to the child’s age as stated on the label, and use the lowest concentration that does the job rather than reaching for a 50% product by default.

What does not work

Three products sell in large numbers on the strength of folklore rather than evidence:

• Citronella wristbands. There is no credible field-trial evidence that a band around the wrist provides area protection. A mosquito is perfectly capable of biting an ankle while a wristband does its thing.
• Ultrasonic devices. These have been rejected by the WHO and by multiple peer-reviewed reviews. The premise — that a device can drive mosquitoes away with sound — has not survived testing.
• Vitamin B1 patches. There is no randomised controlled trial support for the claim that thiamine patches make you less attractive to biting insects, a point made consistently in reviews of repellent efficacy.

The pattern is the same in all three cases: a product that promises protection without chemistry, and no field evidence to support it. A bottle of 20% icaridin is cheaper than a summer of gadgets.

Frequently asked questions

How long does a repellent last before I need to reapply? Follow the manufacturer’s label, which sets out reapplication guidance for that specific formulation. As a general principle, concentration affects duration more than strength — a higher-concentration product extends how long protection lasts, which is why a 50% DEET spray suits a full day while a lower-concentration everyday product does not. Sweat, swimming and rubbing against clothing all shorten the window.

Which repellent should I take to Scotland for midges? A 20% icaridin product such as Smidge, because that concentration covers UK Culicoides midges as well as mosquitoes, and icaridin will not damage synthetic fabrics or plastics. Midges and mosquitoes differ in seasonality and in how their bites present, so a product that handles both is the efficient choice. Keep it in a pocket rather than the bottom of a pack.

Does DEET really damage outdoor gear? Yes — DEET damages plastics, watch crystals, sunglasses coatings and some synthetic fabrics, and this is the complaint that recurs most often among owners on camping forums. Keep it away from your tent’s groundsheet and your GPS screen, and wash your hands after applying. Icaridin does not have this problem, which is the single strongest reason to switch if gear damage is a concern.

Can I use these repellents on a young baby? No blanket answer works, because limits differ by active and by product. The NHS specifically says to avoid DEET on infants under two months, and its guidance on pregnancy notes that DEET is generally considered safe but should be used minimally. Always check the individual product’s label for its own age restriction.

Is DEET-free as good as DEET? It can be, depending on which active you pick. UKHSA lists DEET alongside icaridin rather than ranking one above the other, and at 20%, icaridin has published efficacy data showing protection comparable to DEET against both mosquitoes and UK midges. IR3535, by contrast, has a weaker evidence base at equivalent concentrations, so “DEET-free” covers a wide range of real-world performance.

Why do some mosquito bites swell up far more than others? It comes down to your immune response, not the size of the insect. The mosquito’s saliva proteins trigger histamine release, which produces the swelling and itch, and some people react much more aggressively than others. A genuine allergy can present as larger areas of swelling, hives, blistering lesions and sometimes fever — and in severe cases anaphylaxis is possible, so diagnosis belongs with a healthcare professional.

Is Anthisan available again, and what should I buy if it isn’t? Anthisan (2% mepyramine maleate) has had UK supply disruption, so it is worth checking stock before you set out. If it is unavailable, Boots own-brand antihistamine cream is the closest substitute, while hydrocortisone 1% from Boots or Superdrug own-brand ranges or Eurax HC cream are live alternatives — particularly if the bite has swollen rather than simply itched.

The bottom line

For most UK buyers, a 20% icaridin pump spray covers mosquitoes and midges, is kind to plastics and synthetic fabrics, and is recognised by UKHSA — which is why Smidge That Midge is the easy default. If you need maximum duration in a high-risk setting and can live with the material caveats, Lifesystems Expedition 50 at around £8–£10 is the stronger choice. Whichever you carry, remember that prevention does the heavy lifting: an antihistamine cream from Boots, Superdrug or your local pharmacy will make a bite tolerable, but it will not stop you getting bitten in the first place.