I've tried one brand of Colloidal Silver (or maybe it was ionic silver) which I found to make me feel worse. Silver does have proven efficacy against microbes, but based on the way I felt, I personally wouldn't use it unless I had some kind of stubborn infection that responded to it. And besides, there are plenty of antimicrobials that don't have huge potential for toxicity. You might also want to consider this study: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=Abs...
And the well known potential for argyria with chronic silver use should be considered. I guess I haven't tried real " Colloidal Silver ", so I can't comment on how I feel from using it.
I don't listen to them anymore. I don't consider them a credible source unfortunatley. Very vague. Here is all you have to know about the conspiracy.