Andrea,

you mentioned in a previous post that you are hoping that it has anti-fungal properties because you are struggling with candida.
There is another theory that candida uses heavy metals to survive. That it attaches itself to heavy metals and uses these as a method transportation and that eliminating the yeast would be nearly impossible if you have a large number of heavy metals in your system.
It could also attach to heavy metals in the gut. Possiblity.

So it has anti-viral properties because it prevents viral replication by trapping the multiplying viruses.
And technically speaking it does help indirectly to reduce the candida because it removes it's trump card for survival and therefore allows you to eliminate it completely.
But that is, of course, depepndant on zeolites ability to enhance the excretion of heavy metals.