The Science Behind No Bite Please

That design decision defines the science this page is built on: the entomology of how a mosquito locates a host, and the chemistry of the plant volatiles that interfere with that process. Both are well characterised. Mosquito host-seeking runs on carbon dioxide, skin-derived odours such as lactic acid, body heat and visual contrast, integrated rather than used one at a time. Volatile plant repellents act on the olfactory step of that sequence, in the vapour phase, at a distance from the emitting surface.

For each ingredient we give the study design, the material that was studied and the route of administration. Every figure on this page is traceable to a numbered source with a DOI or institutional link.

Below: how the actives work, what the controlled literature establishes for citronella and for refined oil of lemon eucalyptus, why a controlled-release fabric format suits these molecules, and a numbered bibliography of 23 sources.

A PRODUCT DESIGNED TO STAY OUT OF THE BODY

Most patches in our range are built to move a molecule across the stratum corneum. This one is built to do the opposite. No Bite Please adheres to fabric, not skin, and the plant volatiles it carries are intended to leave the patch into the air. The 500-Dalton rule of Bos and Meinardi (2000) and the rest of the skin-penetration literature describe absorption, and absorption is not what this product does. Where those numbers matter here is exposure: a repellent that stays on the outside of a shirt has a far smaller dermal exposure profile than one rubbed onto skin. No solvent on skin, no rub-in step, no interaction with sunscreen, and no DEET.

HOW A MOSQUITO FINDS YOU

Host-seeking in mosquitoes is multimodal and staged. McMeniman et al. (2014), writing in Cell, mutated the AaegGr3 receptor gene in Aedes aegypti to abolish carbon dioxide detection and showed that CO2 does more than attract: it gates the mosquito response to other cues, including body heat and skin-derived odours such as lactic acid. Attraction to a live human was only partially reduced in CO2-blind mosquitoes, which tells you the system is redundant, and that exhaled CO2, skin volatiles, heat and visual contrast are integrated rather than used one at a time. Published estimates of the range over which mosquitoes orient toward a CO2 source generally sit at 30 metres or less under favourable wind conditions, with much shorter distances typical.

The bite itself is a small pharmacological event. Mosquito saliva contains anticoagulants, vasodilators and a set of characterised salivary allergens. Peng and Simons (2004, 2007) describe the resulting biphasic skin reaction: an immediate, histamine-driven, IgE-associated wheal and flare that appears within minutes and peaks at around 20 minutes, followed by a delayed indurated papule that peaks at 24 to 36 hours and correlates with lymphocyte proliferation responses rather than antibody titres.

WHAT A VOLATILE REPELLENT DOES

A repellent is not an insecticide. It does not kill and it does not trap. It interferes with the olfactory step of host-seeking, so that the mosquito does not resolve the host it is searching for.

Citronella oil is a mixture dominated by citronellal (154.25 g/mol), citronellol (156.26 g/mol) and geraniol (154.25 g/mol). All three are small, and small is what matters here: low molecular weight and high volatility are the properties that put a compound into the vapour phase at ambient temperature. These molecules act on mosquito chemoreception in that vapour phase, which is why a repellent of this kind works at a distance from the emitting surface, and why its behaviour is governed by evaporation rate and air movement rather than by skin permeability.

WHAT THE CONTROLLED DATA SHOW

Citronella repels mosquitoes, and it does so across independent laboratories and methods.

Kongkaew et al. (2011), in Tropical Medicine and International Health, systematically reviewed controlled laboratory experimental studies of citronella preparations and confirmed measurable repellency against Aedes, Culex and Anopheles mosquitoes. The review also identified a formulation lever that works: preparations combining citronella with vanillin as a fixative performed better than citronella alone.

Maia and Moore (2011), in the Malaria Journal, and Diaz (2016), in Wilderness and Environmental Medicine, both reviewed the plant-based repellent field and reach the same core finding: plant volatiles are genuine repellent actives with a real mechanism of action. Diaz places refined oil of lemon eucalyptus, standardised to para-menthane-3,8-diol, as the strongest botanical option available - it is the only plant-derived repellent active registered by the US Environmental Protection Agency and recommended by the CDC, and Carroll and Loye (2006) reviewed field and laboratory data for PMD, applied topically, against Aedes, Anopheles, Culex and Ochlerotatus mosquitoes.

WHY A FABRIC FORMAT SUITS THESE MOLECULES

The property that makes these volatiles work - they evaporate readily - is also the property a formulation has to manage. That is a solved problem in textile chemistry, and a researched one.

Specos et al. (2010), in Transactions of the Royal Society of Tropical Medicine and Hygiene, finished cotton textiles with microencapsulated citronella oil and measured significant repellency against Aedes aegypti, with encapsulation slowing evaporation and extending release relative to the free oil. Tawiah et al. (2025), in Textile Research Journal, review the wider field of mosquito-repellent textiles and the material strategies - microencapsulation, controlled-release matrices, binder chemistry - on which the format is built.

Our patches use a controlled-release matrix for exactly that reason: to meter the release of the volatile load rather than let it flash off. That is the mechanistic case for putting a plant repellent on fabric instead of on skin.

WHY WE MAKE THIS PRODUCT

Because the format has real value of its own. Nothing is applied to skin. There is no solvent, no rub-in step, no interaction with sunscreen, no product on a child's hands to reach eyes or mouth, and no DEET. Patches can be placed at several points close to exposed areas - a sleeve, a hat, a bag strap, a chair cover, a pram cover - rather than relying on a single point source. For a garden, a terrace, a picnic or a pram, that is a sensible way to carry a plant-derived repellent.

No Bite Please rests on three established foundations.

The ingredient science is peer-reviewed. Citronella's repellency against multiple mosquito genera has been confirmed by systematic review of controlled laboratory studies (Kongkaew et al. 2011), and the plant-repellent field as a whole has been reviewed in the Malaria Journal and in Wilderness and Environmental Medicine (Maia and Moore 2011; Diaz 2016). Refined oil of lemon eucalyptus, standardised to para-menthane-3,8-diol, is the only plant-derived repellent active registered by the US Environmental Protection Agency and recommended by the CDC (Carroll and Loye 2006). The mechanism is characterised at the level of the receptor: vapour-phase interference with the olfactory step of host-seeking, a sequence McMeniman et al. (2014) mapped in Cell as carbon-dioxide-gated integration of body heat and skin odours such as lactic acid.

The format is a researched one. Repellent-treated textiles are an established field of study with its own systematic review literature (Tawiah et al. 2025), and microencapsulation of citronella on cotton has been shown to slow evaporation and extend release relative to the free oil (Specos et al. 2010). Our patch applies that principle directly: a controlled-release matrix on fabric, worn on the outside of clothing, with nothing applied to skin and no DEET anywhere in the product.

The third foundation is our own work. We are investing in product-specific testing of the finished patch, and results will be published on this page as they arrive.