Colloidal Silver is a natural antibiotic and anti-fungal. It is also effective in removing impurities in water. These natural properties make this an ideal treatment for skin irritations and superficial injuries as well as internally for minor infection.  Some folks think that if it kills bad bacteria it must kill the good stuff too.  Not so.  Colloidal Silver can only kill pathogens that do not have lipid coating.  The bacteria that is supposed to be in the gut system has a lipid coating that the silver cannot break through.  Thus, making it perfectly safe.