@starrynight - I think it's a little extreme to say colloidal silver should be taken off the market. I've taken it before, and my skin isn't blue.
I was a little disturbed when I heard about argyria a couple of years ago, so I did some research. You have to take a lot of colloidal silver for your skin to turn blue. If you take it occasionally for a bacterial infection or something like that, you should be fine.
You wouldn't take antibiotics every single day. If you did, unpleasant side effects would also occur. Colloidal silver should be used the same way-sparingly, as needed!