I have heard of it being used as an antibiotic, antifungal, and antiseptic spray, as well as being added to the water of people's livestock, I believe as a worming agent.
I think the method of action is metal toxicity. Colloidal silver is (please correct me if I'm wrong) a suspension of monomolecular silver in water. It is thusly made more bioavailable, and so it is easier to get silver poisoning than from other forms.
I know that some areas of botany use colloidal silver to stimulate seed production in unfertilised female plants, resulting in feminised seeds, but that is only a niche application.
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein
What are you doing? You are supposed to be reading this tiny ad!