The best mosquito repellent includes enough active ingredient to repel mosquitoes for multiple hours. The key term is “active ingredient” — only a small number of ingredients are recommended by the Centers for Disease Control and Prevention (CDC). DEET is the most thoroughly researched and widely available — and the most commonly recommended by our experts. But picaridin and oil of lemon eucalyptus are good alternatives if you have sensitive skin or want a natural pick.
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