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Lemongrass oil, cedarwood oil, citronella oil and peppermint oil are among the common ingredients.

They will also continue testing other potential repellent molecules, including the main component in citronella oil, which they found also activates Or31.

The best product containing citronella oil, which has been marketed as the “mosquito plant” and is classified by the Environmental Protection Agency as a biopesticide, protected volunteers for 20 minutes.

Don’t rely solely on candles: People often put scented candles around their yards to repel mosquitoes, and candles made with citronella oil are especially popular.

The repellent contains 5 percent geraniol — a naturally occurring compound that’s found in rose oil, citronella oil and geranium oil.