Centwins Vegetable glycerin is USP certified, viscous liquid provides a thick cloud of vapor and has a light, sweet taste. Centwin vegetable glycerine has a purity of 99.8% and is preserved in HDPE white, opaque plastic bottles. This keeps the liquid fresh until it is ready to be opened and blended. We offer competitive pricing and the highest quality. All products are bottled and shipped from the U.S.A.