The Best Insect Repellents for 2026: Expert Researched & Reviewed
Find the best insect repellent for UK use in 2026. Compare DEET, picaridin, and natural options in our expert guide to keeping mosquitoes and ticks at bay.
The Best Insect Repellents for 2026: Expert Researched & Reviewed
Whether you’re planning a summer camping trip in the Lake District, a long weekend in the Scottish Highlands (where Culicoides impunctatus — the notorious Scottish biting midge — can make life genuinely miserable), or a family holiday to Europe, the one piece of kit you absolutely cannot afford to forget is a reliable insect repellent. Nothing ruins a day outdoors faster than being eaten alive by midges, mosquitoes, cleggs (horseflies), or ticks. In the UK, our damp, warm summers create perfect breeding conditions for biting insects, and with tick-borne illnesses like Lyme disease a growing concern, choosing the right repellent is about more than just comfort — it’s about safety.
We’ve analysed manufacturer specifications, verified owner reviews on Amazon UK and Go Outdoors, and consulted expert guidance from the CDC, NPIC (National Pesticide Information Center), the UK Health Security Agency (UKHSA), and TravelHealthPro to bring you a definitive, no-nonsense guide. We’ll cut through the marketing hype and help you decide between DEET, picaridin, IR3535, and natural alternatives, so you can buy with confidence.
Quick Picks: The Best Insect Repellents at a Glance
| Product | Best For | Key Reason |
|---|---|---|
| Jungle Formula Maximum Strength | Hardcore protection | 50% DEET, up to 9-hour protection, gold standard for high-risk areas |
| Smidge Insect Repellent | Everyday UK use | 20% picaridin, gentle on skin, no strong smell, ideal for midges |
| Mosi-guard Natural | Natural active ingredient, family use | PMD-based, CDC-recommended, suitable for children aged 3 and over |
Note on Avon Skin So Soft Dry Oil Spray: This product is a widely reported midge deterrent and a long-standing cult favourite in Scotland, but it is not classified as an insect repellent and is not approved by the EPA, NPIC, CDC, or NHS as protection against disease-carrying mosquitoes or ticks. If midges are your only concern on a short walk, it may offer some incidental deterrence — but for any genuine protection against ticks or mosquitoes, choose a product with a proven active ingredient as listed above.
How to Choose an Insect Repellent: The Key Ingredients Explained
Before we dive into specific products, it’s worth understanding what actually works. Not all insect repellents are created equal, and the active ingredient is the single most important factor in performance.
DEET (Diethyl-meta-toluamide)
DEET is the most widely studied and proven insect repellent active ingredient. Developed by the US Army in 1946, it has been used by millions worldwide for over 70 years. According to the NPIC, DEET is registered with the EPA and recommended by the CDC for protection against mosquitoes and ticks. The UKHSA also recognises DEET-based products as a primary recommendation for travellers to high-risk regions.
- How it works: DEET doesn’t kill insects; it confuses their sensory receptors, making it harder for them to detect you.
- Concentration matters: A higher percentage of DEET provides longer protection, not stronger protection. 50% DEET (as found in Jungle Formula Maximum Strength) offers around 8–10 hours of protection, while 20% DEET gives roughly 4–6 hours. Importantly, the NHS advises that concentrations above 50% do not significantly extend protection duration but do increase the risk of skin irritation — so higher is not always better. Additionally, the UKHSA recommends a minimum of 20% DEET for effective tick protection in the UK.
- Pros: Proven track record, highly effective against a broad spectrum of biting insects, including ticks.
- Cons: Can feel greasy on the skin, has a distinct chemical smell, and can damage certain plastics, synthetic fabrics, and watch straps. Some people find it irritates sensitive skin.
Picaridin (KBR 3023)
Picaridin is a fully synthetic compound modeled after piperidine, a naturally occurring substance found in black pepper plants. It is entirely manufactured in a laboratory and contains no pepper extract. It has become the go-to alternative to DEET, especially for those who dislike the feel or smell of traditional repellents.
- How it works: Like DEET, picaridin blocks insects’ ability to locate you. It is odourless and non-greasy.
- Concentration matters: A 20% picaridin formulation (such as Smidge) provides comparable protection to a 20–30% DEET product, lasting around 6–8 hours.
- Pros: Pleasant to apply, no strong odour, does not damage plastics or synthetic fabrics, and is less likely to irritate skin.
- Cons: Slightly less effective than high-concentration DEET in extreme, high-risk environments (e.g., tropical rainforests with heavy mosquito pressure). It can also be more expensive per millilitre.
IR3535
IR3535 is a synthetic version of the naturally occurring amino acid beta-alanine. It has been used in Europe for decades and features in a number of family-friendly repellents, including Avon Skin-So-Soft Bug Guard Plus IR3535, which is widely available in the UK.
- How it works: It creates a vapour barrier that deters insects.
- Pros: Very low toxicity profile, gentle on skin, and suitable for use on children from a young age. It is often found in combination with sunscreen. The UKHSA recognises IR3535 as an approved repellent active ingredient.
- Cons: Generally offers shorter protection times compared to DEET or picaridin, typically around 2–4 hours at standard concentrations, requiring more frequent reapplication.
Oil of Lemon Eucalyptus (OLE) / PMD
Oil of Lemon Eucalyptus (OLE) is a plant-based repellent derived from the lemon eucalyptus tree. Its active synthetic version is called PMD (p-menthane-3,8-diol). The CDC recommends OLE/PMD as an effective alternative to DEET, and TravelHealthPro lists PMD-based products — such as Mosi-guard Natural — among its recommended repellents for UK travellers.
- How it works: The PMD compound masks human scent and interferes with insect receptors.
- Pros: Natural origin (when derived from the plant), pleasant citrusy scent, works well against mosquitoes.
- Cons: Shorter protection time (typically 2–4 hours), can be irritating to sensitive skin, and should not be used on children under three years old (see Safety & Usage Guidelines below). It is less effective against ticks than DEET or picaridin.
Natural/Organic Options (Citronella, Lavender, Geraniol)
Many products marketed as ‘natural’ rely on essential oils like citronella, lavender, or peppermint. While they can offer very short-term relief (often less than 20–30 minutes), the NPIC and CDC do not consider them reliable for preventing disease transmission. Accordingly, they are best treated as a supplementary comfort measure rather than a primary protective strategy.
Safety & Usage Guidelines
Choosing the right repellent for your situation is just as important as choosing the right active ingredient. The following guidance is drawn from the NHS, UKHSA, and NPIC.
Age Restrictions
- DEET: Not recommended for infants under 2 months old. For children aged 2 months and older, products containing up to 30% DEET are considered safe when applied correctly. Avoid applying to children’s hands, eyes, or mouth.
- OLE/PMD: Should not be used on children under 3 years old, as per NHS and CDC guidance.
- IR3535 and picaridin: Both have favourable safety profiles for use on children; always follow the specific product’s label instructions.
Pregnancy
The NHS advises that DEET-based repellents can be used during pregnancy when the benefit of protection against insect-borne disease outweighs the risk. Use the lowest effective concentration and apply sparingly. Consult a GP or pharmacist if uncertain.
Application Best Practice
- Apply repellent after sunscreen, not before.
- Do not apply under clothing — repellent should be on exposed skin only.
- Reapply according to the product’s stated duration; sweating and swimming will reduce effectiveness.
- Wash repellent off skin when returning indoors and protection is no longer needed.
- Do not spray directly onto the face — spray onto hands first and apply carefully, avoiding eyes and mouth.
Frequently Asked Questions
What is the most effective insect repellent available in the UK? DEET remains the most thoroughly researched and broadly effective active ingredient, recommended by both the CDC and UKHSA. For most UK uses, a product containing 20–50% DEET or 20% picaridin provides robust protection against mosquitoes, midges, and ticks. The right choice depends on your destination and sensitivity.
Is DEET bad for you? According to the NPIC and NHS, DEET is safe when used as directed. Concentrations above 50% are not recommended as they offer no meaningful extra protection but increase the risk of skin irritation. Avoid applying to broken skin, eyes, or mouth, and wash off when no longer needed.
What insect repellent should I use for ticks in the UK? The UKHSA recommends using a repellent containing at least 20% DEET for tick protection. Picaridin at 20% concentration is also considered effective. Tuck trousers into socks in tick-prone areas and check your skin thoroughly after time outdoors.
Can I use insect repellent on my children? Yes, with caveats. DEET is not suitable for infants under 2 months. OLE/PMD should not be used on children under 3 years. IR3535 and picaridin-based products generally have good safety profiles for children — always follow the individual product label and NHS guidance.
What is the best repellent for Scottish midges? Products containing 20% picaridin (such as Smidge, which is specifically formulated with Scottish midges in mind) are widely reported by outdoor communities to perform well against Culicoides impunctatus. DEET-based products are also effective. Avon Skin So Soft Dry Oil Spray is a popular folk remedy but is not a certified repellent and should not be relied upon for disease protection.
