As of 2015, there is no scientific research supporting claims that colloidal silver provides any health benefits, according to Mayo Clinic. In fact, people who take too much can end up harming their kidneys and giving themselves seizures. Colloidal silver may also interact negatively with a number of important medicines.
Colloidal silver supplement products consist of minuscule silver particles floating in a liquid. They are generally marketed as dietary nutritional supplements that people are supposed to take orally, but they also come in topical and injectable forms as well. Supplement manufacturers claim that colloidal silver cures everything from cancer, AIDS, herpes, prostatitis and eye ailments to shingles and even cancer. However, there are no studies showing any link between colloidal silver and improvement in any of these conditions, as of 2015. The U.S. Food and Drug Administration has even brought action against some colloidal silver manufacturers for making unjustified claims about health improvement, reports Mayo Clinic.
Colloidal silver can build up in the tissues of the body and actually cause harm in some cases. One unpleasant side effect is argyria, a bluish-gray tinting of the eyes, organs, skin, gums and nails. Even after people stop taking colloidal silver, the color remains, according to Mayo Clinic.