no harm as long as the person using the hot sauce is not feeling any discomfort on their mouth or tongue and does not have an gastrointestinal responses (like diarrhea). if hot sauce was harmful there are a lot of people in various cultures that routinely use hot sauce on everything (mexican thai etc. ) that would be experiencing physical harm. and they are not. one of my friend's child was swearing so his parents would but a drop of hot sauce on his tongue as punishment. he liked it too. and. he is still swearing like a sailor.
when is it safe to feed kids hot sauce? . my two year old daughter took some food from my plate that had hot sauce on it. she decided that she really liked it and wanted more. she was even trying to get me to add more hot sauce to it. i don't want to deny her something she likes but at the same time i don't want to harm her either.