It contains pure hypochlorous acid. It is the mild but incredibly effective acidic substance released by our white blood cells to kill germs including bacteria, viruses, fungi, yeasts, and molds but it is completely safe to humans, animals, and the environment.  It is even safe to eyes and mouth. Natrasan kills 99.9999% of harmful micro-organisms in seconds including MRSA, C Diffcile, Norovirus etc. Contains no alcohol, preservatives or fragrances.