Synopsis

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

Geranium (Pelargonium graveolens) essential oil has been investigated for its potential as a natural insect repellent. The scientific evidence supporting its use primarily comes from in vitro and small-scale human studies that have demonstrated its efficacy against various insect species, including mosquitoes. The main active components, such as citronellol and geraniol, are known to possess repellent properties. Several studies have shown that geranium oil, when applied to skin or diffused in the environment, can reduce mosquito landings and bites, although its duration of effectiveness is generally shorter than that of synthetic repellents like DEET.

For example, a study published in the Journal of Vector Ecology found that geranium oil provided significant repellency against Aedes aegypti mosquitoes for a limited duration (up to 2 hours). Another laboratory study demonstrated that geranium oil, especially when blended with other plant oils such as citronella, enhanced repellent effect. Nevertheless, variability in oil composition, concentration, and method of application can affect the results. While more robust, large-scale clinical trials are needed, the current body of evidence does indicate that geranium oil possesses genuine insect-repellent properties, justifying its inclusion in some natural repellent formulations. However, users should be aware that its protection may not last as long as conventional products.

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