Until the beginning of the development of modern antibiotics in the 1940s, colloidal silver was the natural antibiotic of choice and had been for 50 years. Pharmaceutical antibiotics looked like miracles because in the beginning there were no antibiotic-resistant strains of disease organisms. There was a lot of excitement over the new wonder drugs. So naturally, colloidal silver disappeared into the memory hole.
But as there are more and more resistant strains to antibiotics, colloidal silver is reappearing. There is no doubt about the anti-bacterial and anti-microbial properties of colloidal silver.
The most resounding recommendation of colloidal silver, at this time, is that it has been officially disapproved of by the Food and Drug Administration (FDA). The FDA fronts for big pharma, who do not want any competition from a low-cost natural antibiotic like colloidal silver.
The only caveat is that the overuse of certain types of protein-bound silver compounds cause a gray discoloration of the skin called argyria. Most colloidal silver preparations do not have this risk because they are prepared as a homeopathic substance rather than an antibiotic with, of course, the same medicinal effect.