Natural Path / Silver Wings Colloidal Silver is superior in quality and concentration in comparison to other products available on the market and our competitors. There are no chemicals used in the process. Our products are formulated at 50 PPM, 250 PPM and 500 PPM (parts per million). NPSW’s silver is combined with pharmaceutical grade water according to a proprietary formula. Testing and assays of the finished products are completed by qualified independent labs for micron particle size, parts per million, and other analytical tests for purity. Every bottle is packed with extreme care for ultimate protection in transit. Our manufacturing facility is inspected by the State and Federal Food and Drug Administration divisions for food and dietary supplements. We comply with regulations of the American Society of Testing Materials (ASTM), the American Chemical Society (ACS) for water purity and Good Manufacturing Practices for dietary supplements.