While propylene glycol (the active ingredient in Poly Propel) is commonly used as an antifreeze, it is also approved by the FDA for use in food products as a food additive. It is used in food to help retain moisture, improve texture, and enhance flavor. Propylene glycol is considered safe for consumption in small amounts, and is commonly found in a variety of food products such as salad dressings, baked goods, and processed meats. It is important to note that the use of propylene glycol in food is regulated by the FDA to ensure that it is used in safe levels.