NOW® Silver Sol provides 10 ppm. Take 10 sprays 1 to 3 times dialy. Silver Sol is made in the USA using the patented SilverSol Technology®. This patented silver technology has undergone rigorous scientific review. Silver Sol is composed only of elemental silver (10 parts per million) and deionized water, and thus retains the characteristic properties of silver found in colloidal silver. Silver Sol is colorless and odorless. This product is manufactured using SilverSol Technology®. Product is covered under one or more of the following patents: 6,214,299; 6,743,348; 7,135,195 with other patents and patents pending.