When ionic or even Colloidal Silver is suspended in protein, the protein can get moldy even with the silver content. So you can actually get infected with it, which is obviously not what you're looking for with Colloidal Silver .
My only experience with it was buying Silver Wings 500+ ppm to stop the pain of a minor tooth infection where the filling fell out. I paid around $60 for 1 oz of this high ppm silver. It did nothing. I returned it to the health food store and traded up to their 800ppm version for close to $90. Still did nothing. I ended up returning THAT and with no other options just bought 10ppm Sovereign Silver. This took the infection and pain away instantly. Of course this was before I made my own ionic silver which would have been just as effective as the Sovereign.