Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Geranial, a key component of citral found in many essential oils such as lemongrass and lemon myrtle, has demonstrated insect-repellent properties in several scientific studies. Its primary mechanism is thought to be its strong citrus odor, which disrupts the olfactory receptors of insects, making it difficult for them to locate hosts. Laboratory and field studies have indicated that geranial, as part of citral or in combination with other terpenoids, can repel mosquitoes and other biting insects with moderate efficacy. For example, research published in Phytotherapy Research (2006) and Journal of Vector Ecology (2011) reported significant reductions in mosquito landings and bites when geranial-containing oils were applied to skin or used in ambient dispersal devices. However, its duration of protection is generally shorter compared to synthetic repellents like DEET, often requiring reapplication. Regulatory agencies such as the EPA recognize certain essential oils containing geranial as minimum risk pesticides, further supporting its practical application. While geranial is not as widely researched as some other natural repellents (e.g., citronellal), the available data provide scientific support for its use as an insect repellent, though with moderate strength and limitations in long-term efficacy.

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