Propylene Glycol is a solubilizer that can also be found in cosmetics, toothpaste, food and beer. It is sometimes confused with ethylene Glycol, the sweet-tasting ingredient that can be used in air conditioning systems and antifreeze products, but it is a different ingredient. Propylene Glycol is used in our products to help ensure even distribution of the ingredients throughout a product, to help it work better. We also use it as an odor eliminator; as a cleaning agent, or "surfactant," that removes dirt; as a wetting agent; or as a carrier that enables delivery of the product to the surface. In certain products, Propylene Glycol works as a moisturizer helping to prevent a product or surface, like leather, from drying out by retaining moisture making the material softer and more pliable.