The present disclosure relates to methods and products for reducing the viability of microorganisms, and to methods and products for preventing and/or treating microorganism infections. Certain embodiments of the present disclosure provide a method for reducing viability of a microorganism. The method comprises exposing the microorganism to an effective amount of an iron chelator and subsequently exposing the microorganism to an effective amount of a non-iron porphyrin, thereby reducing the viability of the microorganism.
