Natural repellents have a mixed reputation — and mostly for good reason. Here's what the evidence actually says, and how to tell an effective DEET-free repellent from one that just smells nice.
Key takeaways
- Yes, some natural repellents work — but it depends on the active ingredient, not the word “natural.”
- Citronella candles, wristbands and ultrasonic gadgets offer weak, short-lived protection at best.
- One plant-based active stands apart: PMD (para-menthane-3,8-diol), a refined active recognised by the CDC, EPA and ECDC as effective against mosquitoes — and it works on ticks too.
- Concentration, full coverage and reapplication matter more than the brand on the bottle.
- incognito® is built around clinically proven PMD, so you get DEET-free protection that holds up.
Do natural insect repellents actually work, or are they just a feel-good alternative to DEET? The honest answer: some do, and some really don't — and the difference comes down to one thing, the active ingredient.
The short answer
“Natural” isn't a regulated term, and on its own it tells you nothing about whether a product will keep insects off your skin. What protects you is a proven active ingredient at the right concentration. The strongest plant-based option is PMD — also labelled as oil of lemon eucalyptus (OLE) — which independent health bodies rate alongside lower-strength DEET. Most other “natural” products underperform because they rely on oils that simply don't last.
Why natural repellents got a bad reputation
Most people's first experience of “natural” protection is a citronella candle, a scented wristband, a clip-on ultrasonic gadget or a vitamin-B patch. Independent testing has repeatedly found these offer little reliable protection:
- Citronella candles only affect a small pocket of still air, and do little once there's any breeze.
- Wristbands and ultrasonic devices show little to no measurable repellency in controlled studies.
- Plain citronella oil evaporates quickly, so any effect fades within roughly 20–60 minutes.
So the poor reputation is earned — but by the wrong products, not by every plant-based repellent.
The citronella myth
Raw citronella oil smells wonderful and has a mild repellent effect, but it doesn't last long enough to rely on. That's exactly why incognito® uses raw Java citronella oil in soaps and fragrance — for the scent — but relies on the refined active PMD for the actual repellent protection. As a refined, stable molecule, PMD behaves very differently from the raw oil and lasts far longer.
The plant-based active that changes the game: PMD
PMD (para-menthane-3,8-diol) is a refined active most often produced from the oil of the lemon eucalyptus tree (Corymbia citriodora) — though it can also be derived from citronella. You'll see it on labels as oil of lemon eucalyptus (OLE) or PMD. It matters because:
- It is the only plant-derived repellent that the US CDC and EPA list as comparably effective to DEET.
- It provides several hours of protection against mosquitoes from a single application.
- It is recommended against ticks as well as mosquitoes — relevant across central Europe, where tick-borne Lyme disease and TBE are a real concern.
This is the active that incognito®'s repellents are built around — in our formula, PMD derived from Cymbopogon winterianus (Java citronella).
Natural vs DEET: how they compare
| DEET | PMD | Raw citronella oil | |
|---|---|---|---|
| Proven effective | Yes (gold standard) | Yes (health-body recommended) | Limited, short-lived |
| Typical duration | Long | Several hours | ~20–60 minutes |
| Plant-based | No | Yes | Yes |
| Recommended for ticks | Yes | Yes | No |
| Can damage plastics & synthetics | Yes | No | No |
What makes a natural repellent actually work
- Check the active ingredient. Look for PMD or oil of lemon eucalyptus (OLE) — not just “citronella” or a vague “essential oil blend.”
- Mind the concentration. A higher percentage of active generally means longer protection, within the limits stated on the label.
- Cover properly. Ankles, behind the knees and the back of the neck are the spots people miss — and thin clothing isn't a reliable barrier.
- Reapply. Heat, sweat, swimming and time all shorten protection. Top up as the label advises.
- Layer your habits. Avoid heavily fragranced body care that can attract mosquitoes, and use nets or clothing in high-risk areas.
How incognito® approaches DEET-free protection
We built the incognito® range around PMD precisely because it's the one plant-based active with the evidence behind it. The repellent is DEET-free, clinically proven, vegan and biodegradable, and recommended against both mosquitoes and ticks — so you're not trading effectiveness for a kinder formula. If you're new to it, the Insect Repellent Spray is the simplest place to start, and the whole DEET-free range — from lotions to a kids spray — follows the same principle.
FAQs
Do natural insect repellents work as well as DEET?
A PMD repellent is rated comparably to lower-concentration DEET by health authorities such as the CDC and EPA. Citronella-only products like candles and wristbands don't last and shouldn't be relied on.
Is lemon eucalyptus the same as citronella?
No. Oil of lemon eucalyptus — and its refined active, PMD — lasts far longer than plain citronella oil, which fades within about an hour.
Does a natural repellent work against ticks?
Yes. PMD is recommended against ticks as well as mosquitoes. Pair it with covering up and checking your skin after walks in grass or woodland.
How often should I reapply a natural repellent?
Every few hours, and sooner after sweating or swimming. Always follow the reapplication guidance on the product label.
Is DEET-free repellent suitable for the family?
Plant-based repellents are a popular DEET-free choice for families. Always follow the minimum-age guidance printed on the specific product label.
Why does incognito® use citronella in some products but not as the repellent active?
Raw citronella oil smells great and suits soaps and fragrance, but it evaporates too fast to rely on for protection. Our repellent active is PMD — a refined, longer-lasting molecule (in our formula derived from Java citronella) — not the raw oil.
Sources
- US Centers for Disease Control and Prevention (CDC) — Prevent Mosquito Bites (EPA-registered repellents, including OLE/PMD).
- US Environmental Protection Agency (EPA) — Skin-Applied Repellent Ingredients.
- European Centre for Disease Prevention and Control (ECDC) — protective measures against mosquito- and tick-borne disease.
- NHS (UK) — insect bites and stings: prevention.
This article is general information, not medical advice. For protection in areas with a high risk of malaria or tick-borne disease, follow official travel-health guidance and the directions on your product label.