The best defense against Mother Nature is Mother Nature. STEM Kills Ants, Roaches and Flies is rooted in nature, optimized by science. A bug spray for home and outdoors made with botanical extracts deadly for bugs. STEM's scientists decode nature's power, scientifically optimizing it into effective bug-fighting forms.STEM plant-based active ingredient bug spray is formulated with botanical extracts making it safe for use around people and pets when used as directed. This insecticide spray for indoor and outdoor use was tested by entomologists and has no added dye, fragrance, or harsh chemical odors.