You know how jalapeno, habanero, etc peppers burn your mouth when you eat them? The stuff in peppers that makes them hot like that is called capsaicin. Pepper spray is made with pure capsaicin extracted from various peppers and made into something that can be sprayed at people or animals wthat are attacking you. The spray gets into their eyes, nose, mouth, etc. and burns like hell, which tends to make them stop attacking.
Latest Answers