A colleague, Ingrid Naiman, gives further caveats of silver use:

Colloidal Silver: In Vivo or In Vitro

Many of those discussing preparedness for the pandemic are hyping colloidal silver. My involvement with this goes back many, many years. I actually used to sell it but pressure from our blessed government has discouraged almost everyone from taking risks. Quite some time ago, I saw darkfield microscope videos of colloidal silver and what I want to tell you is that while the microbes were destroyed, I cannot recall seeing a single white blood cell in any of the videos. This triggers my pet peeve about what you can determine in a petri dish versus what you observe clinically. It is no doubt true that no microbe survives colloidal silver in a petri dish, but no microbe would survive most fungi or nukes or essential oils or anything else that is too different from the terrain in which survival is possible. The problem, of course, is that the patient must also survive the treatment and this limits the possibilities quite a bit more than we realize.

I don't really have anything against colloidal silver, but I would not take it as an "immune enhancer" because I don't think it works in the manner of an immune supplement. It works like an antimicrobial and in actual clinical situations, I have often found that the conditions or microbes that are easily addressed in petri dishes are not destroyed in vivo. In fact, higher doses might cause pancytopenia and I would really caution people to consider deeply what the ramifications of this are. I would also ask you to question the pundits and ask whether they actually used this treatment on anyone infected or they are hypothesizing based on theories.