Since 1994, Natural Path / Silver Wings' has provided consumers with the highest quality pharmaceutical grade of colloidal silver. They offer various potencies of colloidal silver such as 50 PPM, 250 PPM, 500 PPM, 125 PPM Colloidal Silver with Aloe and Tea Tree Oil Spray and 150 PPM Colloidal Silver Herbal Tincture with Oregano and Echinacea. In addition, they have several topical colloidal silver products available such as 200PPM Silver Aloe Gel with Tea Tree Oil and 250 PPM Silver Herbal Ointment. All products are backed by qualified 3rd party independent research and testing. Natural Path Silver Wing's colloidal silver's mean size is guaranteed to be 2 nanometers in size.