New Studies Explore Coconut Oil and Catnip as Natural Mosquito Repellents

Recent research highlights promising natural alternatives to DEET, the widely used mosquito repellent. Two studies examined plant-based compounds, including catnip (Nepeta cataria) essential oil and chemically processed coconut oil derivatives, finding comparable or even superior insect-repelling effects in some cases.

In Uganda, researchers developed a cream containing 6% catnip essential oil and compared it to a commercial 15% DEET cream. Field tests in mosquito-dense areas showed the catnip cream provided similar protection against mosquito landings over several hours. Even a lower 2% concentration offered significant, though reduced, protection. This is particularly relevant in regions like sub-Saharan Africa, where mosquito-borne diseases such as malaria remain deadly.

Separately, the U.S. Department of Agriculture studied fatty acid compounds derived from coconut oil through chemical processing. These compounds demonstrated strong repellency against various pests, including ticks, biting flies, bed bugs, and mosquitoes. In some tests, they outperformed DEET and maintained longer-lasting effects, especially against ticks and bed bugs. However, regular coconut oil sold commercially does not repel mosquitoes effectively, and the lab-processed compounds are not yet available as consumer products.

Experts caution that these findings do not yet signal the end of DEET’s dominance. DEET, along with Picaridin and PMD (from lemon eucalyptus), remains the most scientifically validated option for daily mosquito protection. Nonetheless, these studies open the door for future development of natural, effective, and locally producible repellents.

Other plant-based repellents under investigation include lemon eucalyptus oil (PMD), citronella, lavender, neem oil, and basil. While some have demonstrated moderate efficacy, their protection duration and potency generally fall short of DEET. Researchers continue exploring formulations that could combine safety, accessibility, and effectiveness, especially for areas where mosquitoes pose serious health risks.