Mosquitoes and other pests are attracted to carbon dioxide coming from our bodies. The only active ingredient in The Bug Patch is natural, organic Vitamin B1 (thiamin). With an elevated level of B1 in your system, you begin to emit Vitamin B1 through the pores of your skin. This Vitamin B1 masks the carbon dioxide also being emitted through your pores. While insects may initially be attracted to carbon dioxide from breathing, once they come in for a closer look, they find your skin unappealing. You can actually watch them approach you and fly away. It really is amazing to experience!