Per- and polyfluoroalkyl substances (PFAS) are a group of over 9,000 chemicals used in the manufacture of water-repellant personal care items and fabrics, non-stick cookware, polishes, paint, wax, cleaning products, firefighting foam, microwave popcorn bags, floss, and even some menstrual underwear. PFAS are toxic to the cardiovascular system and linked to adverse health effects such as increased cholesterol, immune system effects, cancer, thyroid hormone disruption, and effects on infant birth weights.