Colloidal silver is a compound of tiny electrically charged silver particles that are suspended in water due to the electrical charge in each of them. The term colloidal refers to a compound of ultrafine particles suspended in some liquid. When silver comes into contact with unicellular organisms such as viruses, bacteria, etc., it usually reacts by phagocytising or consuming these organisms, leading to their elimination in just a few moments.
As they are tiny particles (between 0.01 and 0.001 microns in diameter), they have the advantage of being able to penetrate fluidly into any tissue, and travel throughout the body, multiplying their effectiveness as they go.