What is the content of ACS 200 200 Parts Per Million (PPM) 99.99% pure silver colloid hydrosol. What silver particle sizes are provided in ACS 200 Extra Strength? ACS 200 Extra Strength contains a very safe size range of pathogen-lethal silver particles - from 0.4 microns down to nanometer. This range of sizes acts as broad arsenal in the pathogen attack. In what sizes is ACS 200 Extra Strength currently offered? ACS 200 Extra Strength is currently offered in either 2 fl. oz (60ml) or 4 fl. oz (120ml) spray bottles. Is ACS 200 Extra Strength patented? Yes. The silver technology of ACS 200 Extra Strength is backed by over 14 patents to date. Will weather elements affect the product (like heat or cold) during delivery or if the product sits at home or outside a Dr's Office? The only way the product would be affected is if it is cold enough to freeze the product (splitting the bottle) or hot enough to melt the bottle. What is the shelf life of the Results RNA® formulas? It has an indefinite shelf life.