I have seen on TV a woman that took Colloidal Silver as a child for a few years and as a result her skin became permanently grey. I mentioned this to my doctor who is providing Colloidal Silver to me as a treatment for nanobacteria. He said that it is true and that many of the Colloidal Silver out there will build up in the skin because the particles are too big for our bodies to rid ourselves of them. He is giving me colloidal silver where the particles are so small they will not be stored in the body. I am still weary of it since if that were to happen there is no cure. What I was wondering if there is anybody out there that has taken this stuff daily for a few years without that dreaded side effect. I will of course ask my doctor next time I see him whether he has patients that have taken it for that long. But in the meantime, I wouldn't mind hearing from some of you out there.