Kosher Propylene Glycol, USP Grade Kosher Vegetable Glycerin, Artificial Flavorings and Nic Select Brand 100% pure nicotine are used in the production of E liquid. Their manufacturing process begins in a Certified ISO 7 clean room to ensure that any juices made within the labs are not contaminated. Utilizing high efficiency, particulate fans, with a positive pressure air flow, the clean room maintains a contaminant free environment at all times, – delivering a safe, and ultra clean product.