This Vegetable Glycerin is the highest quality available anywhere. Our VG is bottled in a Class 8 Clean Room environment. All of our bottles are pre-sterilized. Our bottling line for this Vegetable Glycerin is exclusively dedicated to VG to eliminate any possibility of cross contamination. Unlike other sources of Glycerin on the market, our bottling equipment will never be used to process dangerous or caustic material. The safety and purity of our Vegetable Glycerin is our number one priority.