Pro Colloidal Silver is the best colloidal silver on the market and reasonably priced. I use colloidal silver in many ways, and believe not to be exaggerating when stating that it maybe saving a member of my family's life. It saved some of my precious plants in the garden. I use it from eye drops, general disinfectant for sores, cuts and grazes, to a remedy against minor gastric upsets. It is also brilliant for spraying precious plants against fungus and rot. The company gives a fine old fashioned personal service. I am delighted to have found them and look forward to more. Thank you so much.