r formaldehyde, toluene and dibutyl phthalate that are the only ingredients to consider when it comes to nail polish. Benzophenone-1 (BP-1) in particular stands out as a concern. Benzophenone-1 is used as a UV absorber in cosmetic products, it’s been found to have estrogenic activity (5, 6, 7, 8) and it’s found in a lot of “XX-free” nail polishes. And the same goes for benzophenone-3. (5)