25 Oct 2022 --- Per- and polyfluoroalkyl substances (PFAS) in cosmetics can penetrate the human skin barrier and accumulate within the body, increasing the risk of cancer. This is according to research from the German Federal Institute for Risk Assessment within the Department of Food Safety that assessed the impact of 13C4-Perfluorooctanoic acid (13C4-PFOA) mixed into a commercial sunscreen.