Not only that, but each of the dermatologists, biologists and entomologists we spoke to highly recommend DEET as one of the top two active ingredients to look for in a repellent. And it remains ...

We only tested bug sprays with active ingredients approved by both the Centers for Disease Control and Prevention (CDC) and Environmental Protection Agency (EPA): DEET, picaridin, oil of lemon ...

Here's how long common active ingredients will last: The majority of popular bug-spray brands, such as Off, contain N,N-diethyltoluamide, more commonly referred to as DEET, as their active ingredient.

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James says four active ingredients are scientifically proven to work on mosquitoes. Three of them: DEET, IR3535 and Picaridin (also known as Icaridin) are human-made, but the fourth, PMD ...