Hey Izzy,
Out of all the homeopathy recommendations in "When tech fails" I could see how the whole "colloidal silver" could potentially have a beneficial effect. In some of our microbiology classes here on campus I learned a positive charge does provide a mild antimicrobial effect. Since silver is relatively benign it has been used in everything from tooth fillings to polyester clothing to help decrease microbial growth. I even read a while back of folks making counters with a positive charge to kill bacteria.
Although taking it everyday seems excessive. We need a little exposure to bugs to adapt and retain our immunity. Don't want to get into a "bubble boy" scenario.
~Logan.