Products and container components are always carefully matched. Sustainability is always an essential consideration, as is product shelf life, stability, prevention of contamination by micro-organisms, and usability by the consumer. These issues are repeatedly re-evaluated for the best and most up-to-date solution. Some iS Clinical products must be placed in glass containers with glass droppers. All iS Clinical ingredients are of the best quality that can be found and the majority are pharmaceutical grade. These are active ingredients and some of these products require glass containers because glass is inert. All pumps contain some plastic components that will touch the product and cause problems with the product. Therefore, for some iS Clinical products, pumps cannot be used. Some containers have an inner glass sleeve.