A lotion formulated 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 trailed only marginally.

Dr. Simon Scofield, a senior lecturer at Cardiff University, presented the findings. Trials were run in eastern Uganda, where volunteers tracked how many mosquitoes landed on their legs over the course of an evening — a standard field metric for repellent efficacy that avoids reliance on laboratory chambers alone.

The active compound is nepetalactone, the same terpenoid responsible for the euphoric response cats display around Nepeta cataria. Its insect-repelling properties have drawn scientific attention for years, but the Florence presentation adds field-level validation to what had previously been a largely laboratory-bound claim.

From lab bench to field trial

The pathway here spans two peer-reviewed papers. A 2024 study in Scientific Reports established the laboratory case, finding that catnip essential oil 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 synthesizes both studies alongside the SEB presentation, and the abstract underpinning the conference talk is catalogued in the SEB Florence Abstract Book 2026.

The Stockholm Environment Institute had already 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. That framing matters for understanding the intent behind the research: this was never conceived purely as an academic curiosity but as a deployable public health tool.

The economics of repellent access

The commercial and distribution model separates this project from most repellent research. The lotion is designed for local manufacture by a community enterprise, keeping unit costs low enough for rural Ugandan subsistence farmers who cannot afford imported Deet products. Distribution so far has relied on grant funding, with the formulation given away free to participating communities.

The next phase, according to the research team, aims to scale production and introduce sales — building toward a self-sustaining income stream for the workers involved in manufacturing rather than perpetual dependence on donor funding. That model echoes a broader pattern in global health interventions, where the gap between proof-of-concept and sustained access often proves harder to close than the initial scientific breakthrough.

Cost has long been the binding constraint on repellent uptake in malaria-endemic regions, more so than efficacy. Deet is effective and well-studied, but its price and supply chains have kept it largely inaccessible to the populations facing the highest malaria burden. A locally producible alternative that matches Deet's field performance addresses that constraint directly, rather than offering a marginal improvement on an already-available product.

Why the malaria burden gives this weight

The World Health Organization estimated 282 million malaria infections and 610,000 deaths globally in 2024, with the majority of fatalities among young children in African countries. That burden frames why a low-cost, regionally manufacturable repellent draws attention beyond entomology circles — vector control sits alongside bed nets, indoor spraying, and antimalarial drugs as one of the few interventions that can be deployed at household level without depending on clinical infrastructure.

Nothing in the current findings should be read as displacing existing vector-control tools. Repellents reduce human-mosquito contact but do not address mosquito breeding, resistance to insecticides, or the broader entomological and parasitological drivers of transmission. Field trials measuring landing rates over a single evening also differ from longitudinal exposure studies that would capture seasonal variation, mosquito species diversity, and real-world compliance over months rather than hours.

The commercialization plan will be the harder test. Manufacturing consistency, shelf stability of a plant-derived essential oil formulation, and the transition from grant-subsidized distribution to a paying customer base are the kinds of operational hurdles that have stalled comparable social enterprises before. Whether the catnip lotion project navigates that transition will determine if the scientific result translates into sustained public health impact, or remains a well-documented but narrowly deployed intervention.