You can safely eat up to 27 cayenne peppers per day without any health issues.
However you're unlikely to be able to eat 27 cayenne peppers per day without getting stomach aches or burning your mouth.
I can't eat no more than 4 cayenne peppers in one day and I can't eat them everyday either because my stomach will start hurting as a result.
The cayenne peppers are healthy for you in moderation and can help boost your bodies immune system and fight diseases such as cancer.
So eat them in moderation and if your stomach is starting to hurt then you should slow down on the amount of cayenne peppers you're eating.