You're on overload with negative info on silver. Go to "SilverLungs.com" and read their info on differences of the various forms of silver solutions.
Read all the info and find a true colloidal product to try. I make my own with a silverlungs generator and it works fine(no colds or flu for 2 years).
There are medical "practitioners" who try to demonize the use of colloids(silver in particular) who are only protecting their income streams or seek exposure to big pharma or medical boards for rapid career advancement.
You will never get the information you seek from sources controlled by AMA, FDA, or USDA as they thrive on funds from the established medical-pharmaceutical community.