Nature's Oil Propylene Glycol, or PG, is of the highest quality. We fill this right here in the USA in an FDA registered facility. Propylene glycol is a clear, syrupy synthetic liquid, with no color, odor, or taste that is completely soluble in water. Because it helps the skin absorb moisture, it is commonly used as an emulsifier for skin hydration, and as a stabilizer. This makes it a great ingredient for skin care products. Propylene glycol is a common ingredient in serums, body oil, lotions, moisturizers, sunscreens, soaps, cleansers, and shampoos. Nature's Oil Propylene Glycol is NON-GMO, vegan, and not tested on animals.