While most view colloidal silver as quackery, the fact is that using silver in colloidal form along with other medicine administered at the same time, was standard practice 80 years ago.
Perhaps silver in nanoparticle form will make a comeback, as bacteria don't seem to be as able to survive the cell wall disruption that silver can cause.
There are actually studies being done around implementing exactly that with antibiotics... However there is also the fun danger of your skin turning incurably silvery blue thanks to the silver component in the antibiotics... No really.
Perhaps silver in nanoparticle form will make a comeback, as bacteria don't seem to be as able to survive the cell wall disruption that silver can cause.