The skin is your largest organ.
Whatever you put on it, goes in it. Harmful chemicals that are applied topically via your cosmetics can permeate the skin, get into your blood stream and from there, into your entire body. Over time, they can accumulate, damage your cells, harm your organs and disrupt your endocrine system. In short: The type of products you use (soap, shampoo, lotion, makeup, and yes, sunscreen!) highly matters.