PFAS, or per- and polyfluoroalkyl substances, are a group of widely-used chemicals that are all around us and in thousands of common consumer products. They're called "forever chemicals" because they don't degrade quickly due to an extremely strong carbon-fluorine bond. They accumulate and persist in both the environment and the human body.

The endocrine system is a network of glands that produce hormones, the chemical messengers that control and coordinate systems throughout the body including reproduction, growth, brain development, metabolism, digestion and much more.