There is a reason why colloidal silver is sold in the USA as a "dietary supplement." Supplements are not required to be examined or evaluated by the Food and Drug Administration and are "just for fun" and can make any outrageous claim they want about effectiveness.
The ingestion of colloidal silver in any amount may interact with actual medications, to include antibiotics, and cause permanent injury. The excessive use of colloidal silver may also do this on it's own without needing to mix with medication.
Colloidal silver is one of those things where there is zero effect for most people, and then you have the sporadic, random encounter with someone that "benefited" from the colloidal silver by coincidentally ingesting it and achieving identical results as if they had not taken it. (i.e. the healing of a wound that your body was already healing)
It's kind of like me picking up a random rock from the ground and saying that the rock protects me from tigers. The evidence I use is that I am currently not under attack from tigers, something that existed prior to my picking up the rock. I give it to you and, since you don't live in a south east Asian jungle, you're not plagued by tigers, either. Clearly it works.
