ABC News
Human-made chemicals known as PFAS are back in the spotlight after the feminine hygiene company Thinx settled a class-action lawsuit earlier this month for millions of dollars. The lawsuit was brought against Thinx by customers who claimed testing showed the brand's period underwear -- advertised by the company as sustainable, organic and reusable -- contained PFAS, otherwise known as per- and polyfluoroalkyl substances, or forever chemicals. PFAS are manufactured chemicals that have been used in products like nonstick cookware, cosmetics and water-repellent clothing for decades, but have more recently been discovered to cause adverse health effects in some instances, according to the Centers for Disease Control and Prevention.