The best defense against Mother Nature is Mother Nature. Meet STEM Repels Mosquitoes: mosquito repellent spray made with botanical extracts that are safe for you, but unbearable for insects. STEM?s scientists decode the power of nature, scientifically optimizing it into effective bug-fighting forms. STEM plant-based insect spray repels mosquitoes and is safe for use around people and pets (when used as directed). Formulated with botanical extracts to keep bugs away, it has no added dye, fragrance, or harsh chemical odors and was tested by entomologists. STEM helps protect your family. Rooted in Nature, Optimized by Science.