A lotion made from catnip oil repels mosquitoes as effectively as Deet, according to field trial results presented at the Society for Experimental Biology conference in Florence, Italy The Guardian. The research, conducted by a team working between Uganda and Wales, found that a 6% catnip oil lotion performed on par with a 15% Deet lotion—the concentration most widely available in Uganda—while a 2% formulation lagged only marginally behind.

Dr. Simon Scofield, a senior lecturer at Cardiff University, presented the findings. Trials took place in eastern Uganda, where volunteers tracked mosquito landings on their legs over the course of an evening. This field-based measurement is the standard way to assess repellent performance and avoids relying solely on laboratory chambers, which can mask real-world variations.

The active compound is nepetalactone, the same terpenoid (a type of organic molecule) responsible for the euphoric effect cats experience around Nepeta cataria—common catnip. Scientists have known for years that nepetalactone repels insects, but the Florence presentation provides the first field-level validation of what had previously been demonstrated mainly in labs.

From lab bench to field trial

The research spans two peer-reviewed papers. A 2024 study in Scientific Reports established the laboratory findings, showing that catnip essential oil at concentrations as low as 2% repelled more than 70% of mosquitoes in controlled conditions Nature/Scientific Reports. A follow-up 2026 paper in the same journal moved the work outdoors, testing an essential oil blend comprising more than 92% nepetalactone under real field conditions in eastern Uganda Nature/Scientific Reports. The Guardian's July 7 report brings together both studies and the SEB presentation, with the conference talk abstracted in the SEB Florence Abstract Book 2026.

The Stockholm Environment Institute had flagged the underlying project in February 2025 as a bio-based innovation aimed at commercializing plant-derived repellents—soaps, sprays, and lotions—for eastern African markets SEI. This framing matters: the research was never framed as an academic exercise in isolation but as a tool with direct public health application.

The economics of repellent access

What distinguishes this project is its commercialization model. The lotion is designed for local manufacture by community enterprises, keeping unit costs low enough for rural Ugandan subsistence farmers who cannot afford imported Deet products. So far, distribution has relied on grant funding, with the formulation given free to participating communities.

The research team plans to scale production and introduce sales in the next phase—building toward a self-sustaining income stream for the manufacturing workers rather than perpetual donor dependence. This mirrors a common challenge in global health: closing the gap between proof-of-concept and sustained, scaled access often proves harder than the initial scientific breakthrough itself.

Cost, not efficacy, has long been the main barrier to repellent uptake in malaria-endemic regions. Deet works and has been extensively studied, but its price and global supply chains have kept it out of reach for the populations bearing the highest malaria burden. A locally producible alternative that matches Deet's field performance addresses this constraint directly, rather than offering a marginal improvement on a product already inaccessible to those who need it most.

Why this matters for malaria control

The World Health Organization estimated 282 million malaria infections and 610,000 deaths globally in 2024, with the majority of deaths among young children in African countries. This burden explains why a low-cost, regionally manufacturable repellent draws attention beyond entomology—vector control (reducing contact between humans and disease-carrying insects) sits alongside bed nets, indoor spraying, and antimalarial drugs as one of the few household-level interventions that do not require clinical infrastructure.

The current findings should not be interpreted as a replacement for existing vector-control tools. Repellents reduce human-mosquito contact but do not address mosquito breeding sites, insecticide resistance, or the deeper entomological and parasitological drivers of transmission. Single-evening field trials measuring mosquito landings also differ fundamentally from longer-term studies that would capture seasonal variation, shifts in mosquito species, and real-world compliance over months or years.

The commercialization phase will be the harder test ahead. Manufacturing consistency, shelf stability of a plant-derived essential oil formulation, and the transition from grant-subsidized free distribution to a paying customer base represent the operational challenges that have derailed comparable social enterprises in the past. Whether the catnip lotion project clears those hurdles will determine whether the scientific result translates into sustained public health impact, or remains a well-documented but limited intervention.