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Glowy oils, tinted creams, misty sprays and chalky sticks: Like many people this summer, my pool bag holds a stunning variety of sunscreens. They come in different forms, but all rely on a handful of the same sun-shielding ingredients. In the United States, this ingredient list hasn’t changed in 20 years — until now. The U.S. Food and Drug Admin- istration has added a new chemical, bemotrizinol, to the list of permitted sunscreen ingredients. “I think we should all be super excited,” says dermatologist Tanya Hathaway. Bemotrizinol is more long-lasting than some other sunscreen ingredients, it’s not readily absorbed into the bloodstream and it offers a new line of defense against the kind of solar radiation that ages skin. …