"...What the Science Says About the Safety and Side Effects of Colloidal Silver ◾Colloidal silver can cause serious side effects. The most common is argyria, a bluish-gray discoloration of the skin, which is usually permanent. ...
Um, no. This is not accurate.
The thing that causes argyria (blue discoloring of the skin) is not CS itself but contaminants present when CS is made.
Some folks, to save money, use CS made from .999 grade silver (three 9s). That other .001 can be anything. Lead, for instance. That's because that grade of silver is not meant to be ingested. It is jewelry-grade. The goal of that grade is to be ductile and easily shaped/formed into jewelry.
CS should only be made from .9999 silver (with four 9s). This is medical-grade. It is more expensive by far.
Also, some folks put salt in the water when they make CS, to increase conductivity. I think salt speeds up the process. But the thing is, the Cl in NaCl is a contaminant, because the Cl readily binds with the silver, forming some compound we don't want.
The subtext of that FAQ page seems to be "Stick with Big Pharma; they know what's best".
Where are you buying .9999 grade? (99.9999)