Colloidal silver is a natural, powerful antibiotic and anti-viral. It is used to prevent infections and was used before penicillin was invented. A teaspoon taken at the onset of a cold is known to shorten symptoms. It is a colourless, odourless, tasteless liquid. Fabulous, every house needs one. Kid safe too. Do not take for longer than 7 days in a row. Contains 1 x 30ml bottle.