Colloidal Silver is effective against over 900 types of bacteria, fungus and yeast. It enhances the body's own immune system to better remove residue pathogens and thereby fend off disease.* Our product is amber in color. It is a silver protein (silver particles suspended in a protein binder), the higher the concentration (PPM) the darker the color. Available with a dropper and in 2 and 4 oz. bottles. *These statements have not been evaluated by the Food and Drug Administration.