Cayenne Pepper can sometimes stop a heart attack if the heart attack hasn't gotten too severe.
The best thing to do though is to call 911 if you think you're having a heart attack and then put an aspirin under your tongue and let it dissolve while waiting on the ambulance.
Always call 911 and get an ambulance to you when you think you're having a heart attack as it's better to get the ambulance there and not need it than not have them there and need them.
Cayenne Pepper does help improve your heart health though when eaten and can also help with fighting off other diseases so the Cayenne Pepper is healthy for you to eat.