"Botanical" on a repellent label can mean three completely different things: a compound the EPA has tested and registered, a plant oil that is legally exempt from testing, or a fragrance note in a moisturiser that was never meant to repel anything. Only one of those tiers comes with real efficacy data behind it, and it's usually not the one the marketing leans on hardest.
Why botanical mosquito repellent ingredients matter more than the label admits
Here's the thing about that word: it's true and slippery at the same time. Poison ivy is botanical. So is opium. "Plant-derived" tells you where a molecule came from, not what it does to a mosquito's nervous system, and the regulatory system underneath these products cares about that distinction far more than the shelf copy does.
In the US, a repellent ingredient sits in one of three buckets, and which bucket it's in changes what you're actually allowed to assume about it.
Tier one: the botanicals the EPA actually registered
The EPA keeps a public list of active ingredients approved for skin-applied repellents, and as of its most recent update it names eight. Most people could name DEET and picaridin. Fewer know that four of the remaining six are plant-derived, and one of them is, genuinely, catnip.
Oil of lemon eucalyptus (OLE) and its refined component PMD are the best-known of the group. The EPA lists OLE separately from PMD (it "contains pmd, but is a separately regulated pesticide chemical"), and both the EPA and the CDC recommend it alongside DEET, picaridin and IR3535. Penn State Extension's repellent guide puts a 30% OLE product at 2 to 5 hours of protection for ages three and up, and flags that it should not be used on children under three, a caution the CDC repeats directly.
2-undecanone, also called methyl nonyl ketone, has a stranger origin story. It comes from a wild relative of the cultivated tomato plant, and it was registered by the EPA in 2007 under the brand name BioUD. Peer-reviewed arm-in-cage trials published in the Journal of Medical Entomology found no statistical difference in repellency between BioUD and 7% DEET over a 6-hour test window against Aedes albopictus, though it performed less well than 15% DEET over the same period. It's a genuinely tested botanical, just one that never became a household name.
Oil of citronella sits on the EPA's registered list too, with a handful of registered products alongside a much larger number sold under the minimum-risk exemption below. NPIC's insect repellents fact sheet is blunt about the practical result: citronella works, but the concentration on a label tells you almost nothing about how long it lasts, because "citronella" as a marketing word covers wildly different formulations.
Catnip oil, from Nepeta cataria, is the one that surprises people. The EPA lists it among registered skin-applied actives, with four registered products. Its history traces back to Iowa State University research published in the early 2000s, where scientists Chris Peterson and Joel Coats studied nepetalactone, the compound responsible for catnip's smell, as a mosquito repellent. That research is also where the famous "ten times more effective than DEET" claim comes from, and it's worth being honest about what that claim actually measured: repellency onset in a filter-paper laboratory assay, not a real-world wear test against a currently marketed DEET product. It's a genuine, published, EPA-registered finding. It is not the same kind of evidence as a multi-hour field trial, and only a small number of catnip-based products have ever reached the market.
Tier two: legal to sell, never actually evaluated
This is the tier that causes the most confusion, because the products in it look and sound identical to tier one.
The EPA operates a "minimum risk pesticide" exemption (often called 25(b)), for ingredients the agency has judged to "pose little to no risk to human health or the environment." Citronella (again, sold both ways), cedarwood oil, geranium oil, peppermint oil and soybean oil are common examples sold under this exemption. Being on the list is a genuine regulatory fact. It is also, specifically, not a safety or effectiveness review. Penn State Extension's guide says this in about as many words: minimum-risk repellents "have not been evaluated for effectiveness or safety."
That doesn't mean they do nothing. A widely cited 2011 review by Maia and Moore in Malaria Journal found lab-measured repellency for several of these oils, cedar and geranium among them, in the range of roughly 60 to 180 minutes. It does mean nobody outside the manufacturer has checked that any specific bottled product delivers that. The regulatory shortcut and the efficacy gap travel together, and a label can't tell you which side of the gap you're on.
Why the good botanicals still fade fast
Even the ingredients with real data behind them share a physical problem: volatility. Maia and Moore's review is direct about it. Essential oil actives "tend to be highly volatile," meaning they evaporate off the skin far faster than a synthetic like DEET, which is one reason a citronella candle or a plant-oil spray can feel effective for twenty minutes and then just... stop. It isn't a formulation failure exactly. It's closer to a property of the chemistry itself, and it's the main reason reapplication matters so much more for a botanical active than for a synthetic one.
Where a scented moisturiser fits, and where it doesn't
There's a fourth category that never makes it onto the EPA's list at all: cosmetics that use the same plant families for scent, without registering as repellents. Misaj, a skincare brand formulated and produced in France, makes one of these: Glow Protect. On its own product page, as listed on 5 September 2026, the brand describes it as combining "hydration, skin barrier support and botanical mosquito protection in a single cream," built around "a natural aromatic blend that helps deter mosquitoes," including eucalyptus citriodora, geranium, Atlas cedar and clove. Read against the tiers above, that's a blend of a tier-one plant family (the Eucalyptus Citriodora note sits in the same botanical lineage as the registered OLE active, though the two are not the same regulated substance) and tier-two aromatics with lab-level but unevaluated support. It's an EU cosmetic, priced and formulated as a daily skincare product, not an EPA-registered repellent with its own registration number and label-tested protection window. That's a description of the category it's in, not a verdict on it.
What this actually means when you're shopping
If a specific number of hours matters to you (a hike, a wedding outdoors, a trip somewhere mosquito-borne illness is a genuine concern), the honest move is to look for an EPA registration number and a stated protection time on the label, and to talk to a pharmacist or doctor about destination-specific risk. That decision doesn't belong to a shelf full of pleasant-smelling oils, however well-sourced the plants are.
If what you want day to day is something that smells good, feels like skincare, and leans on the botanical families that at least have some published data behind them, tier two and the cosmetic category both have a real place. Just hold the claim to the same size as the evidence: "smells of citronella" is not the same sentence as "repels for six hours," and no label should be read as if it were.
Frequently asked questions
Are botanical mosquito repellents EPA-registered?
Some are and most aren't. The EPA registers a small list of skin-applied actives that includes several plant-derived compounds: oil of lemon eucalyptus and its component PMD, oil of citronella, catnip oil and 2-undecanone. Far more botanical-branded products, cedarwood, geranium, peppermint and soybean oil among them, are sold under a separate exemption that the EPA and Penn State Extension both describe as never having been evaluated for effectiveness or safety.
Is catnip oil really a registered mosquito repellent?
Yes. The EPA lists catnip oil (Nepeta cataria) among its registered skin-applied active ingredients, currently across four registered products. The research behind it traces to Iowa State University's work on nepetalactone in the early 2000s, though the well-known "ten times more effective than DEET" figure comes from a lab volatility test, not a head-to-head field trial against a modern DEET product.
Do botanical repellents last as long as DEET?
Generally, no. Published reviews describe most plant-oil actives as highly volatile, meaning they evaporate from skin faster than synthetic alternatives. Registered botanicals like OLE and 2-undecanone come closest to matching DEET's duration in controlled testing; unregistered minimum-risk oils have shown shorter lab-measured windows and, per Penn State Extension, no formal evaluation of any specific bottled product.
For the DEET safety question underneath all of this, see is DEET safe? a skincare-first look, and for the full product breakdown, see how Glow Protect combines skincare and mosquito repellent.
Sources (fetched 2026-09-05)
- US EPA, Skin-Applied Repellent Ingredients (page states "Last Updated: January 23, 2026"; lists catnip oil, oil of citronella, DEET, IR3535, PMD, oil of lemon eucalyptus, picaridin and 2-undecanone as the eight registered skin-applied actives). https://www.epa.gov/insect-repellents/skin-applied-repellent-ingredients
- US EPA, Minimum Risk Pesticides (the 25(b) exemption: EPA states it has "exempted them from the requirement that they be registered"; page states "Last Updated: August 31, 2026"). https://www.epa.gov/minimum-risk-pesticides
- CDC, Preventing Mosquito Bites / Prevent Mosquito Bites (the CDC-recommended active-ingredient list: DEET, picaridin, IR3535, OLE, PMD, 2-undecanone; page last reviewed August 28, 2024). https://www.cdc.gov/mosquitoes/mosquito-bites/prevent-mosquito-bites.html
- Penn State Extension, Tick and Mosquito Repellent Guide (OLE 30% at 2 to 5 hours for ages 3+; the minimum-risk exemption list and "have not been evaluated for effectiveness or safety"; page last updated May 10, 2022). https://extension.psu.edu/tick-and-mosquito-repellent-guide
- NPIC, Insect Repellents Fact Sheet (citronella formulation variability; CDC's recommended active-ingredient framing). https://npic.orst.edu/factsheets/repellents.html
- Maia, M.F. and Moore, S.J., "Plant-based insect repellents: a review of their efficacy, development and testing," Malaria Journal, 2011 (volatility of essential oil actives; lab-measured durations for cedar, geranium and other minimum-risk oils in the roughly 60-to-180-minute range). https://pmc.ncbi.nlm.nih.gov/articles/PMC3059459/
- Zhang, A. et al., "Novel arthropod repellent, BioUD, is an efficacious alternative to deet for use against mosquitoes, ticks, and biting flies," Journal of Medical Entomology, 2008 (2-undecanone/BioUD origin from a wild tomato relative; 6-hour arm-in-cage comparison against DEET). https://pubmed.ncbi.nlm.nih.gov/18826032/
- ScienceDaily, reporting on Iowa State University / American Chemical Society research by Chris Peterson and Joel Coats, "Catnip Repels Mosquitoes More Effectively Than DEET," 2001 (the origin of the "ten times more effective" figure, reported as a filter-paper repellency assay). https://www.sciencedaily.com/releases/2001/08/010828075659.htm
- misajskin.com, Glow Protect product page (price, format, quoted brand wording, full INCI list, as listed 2026-09-05). https://misajskin.com/products/glow-protect