Colloidal-Silver: Since the early 1900's, this mixture has been used for medicinal purposes.

When anti-biotics came on the scene, it was readily replaced. Some physicians today still prescribe it for beneficial uses such as the list below;
germicide
disinfectant
eye problems
topical infections
internal disease-epilepsy
common cold/flu
gonorrhea
diabetes
cancer
hiv/aids
tb
fatigue

Adverse Side Effects: Possibly, since the over prescribing of antibiotics, (creating resistance to many diseases), Colloidal Silver has found a "comeback"; Treating for staph infections, to treating e.coli.

Adverse Side Effects: There is no medical evidence for these claims, (as there are no conclusive human studies to date), for it's effectivness.

There has been reports of ingestion of the improper amount can be toxic, so with all herbal applications for health,the same precautions should be taken and be educated and advised by a physician. 

It needs to be noted that ingesting a Silver product, it can reduce the absorbtion of prescribed antibiotics, therefore reducing their effectiveness.