Helps to kill almost all viruses, fungus, bacterium and other organismsAmino Acid And Botanical Colloidal Silver 500 Ppm. Amino acid and botanical supply colloidal silver is made of silver particles of very small size (.001-.002 microns) placed into colloidal suspension in distilled water at a concentration or no less than 500 ppm. Suitable for vegetarians. Colloidal Silver 500 PPM- {PPM =s Parts per million}. In 1912 an article in the the lancet compared various concentrations of colloidal silver for efficacy. The authors of the article determined that 500 PPM or above was the most reliably effective concentration. Amino acid and botanical supply colloidal silver which is made electrostatically to drive individual molecules of silver of therefore very small particle size into colloidal suspension in triple-distilled water is 500 parts per million plus or minus 50 P.P.M. Assay of particle size as well as concentration in P.P.M. Colloidal silver is a suspension of the element silver in a solution usually water.