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The most common active ingredients found in chemical sunscreens in the United States are ensulizole, octisalate, homosalate, octocrylene, octinoxate, oxybenzone, and avobenzone. The most common active ingredients in physical sunscreens are titanium dioxide and zinc oxide.
As of right now, the FDA has classified only the active ingredients in physical sunscreens as generally recognized as safe and effective.
They have not given this distinction to any of the active ingredients in chemical sunscreens, but this may change as they get more data. While the ingredients in chemical sunscreens have not been proven to be harmful, some parents prefer to go with the ingredients in physical sunscreens that are thought to be safe at this point.
Two of the common chemical sunscreen ingredients have come under more scrutiny than the rest: oxybenzone and octinoxate. According to Shainhouse, they "have demonstrated possible hormone-disrupting behaviors in animals when they consume large quantities of the chemical." These chemicals have also been found to be harmful to coral reefs. For these reasons, we did not include any sunscreens with oxybenzone or octinoxate in this guide.
Despite the ingredients in physical sunscreens potentially being safer, many people still prefer chemical sunscreens because they are typically easier to rub in, and they don't leave a white layer on the skin like many physical sunscreens do. Because there is no conclusive evidence proving the ingredients in chemical sunscreens are harmful, we tested both physical and chemical sunscreens for this guide. However, physical sunscreens landed in the top spots after testing.
What really matters, according to all the dermatologists we spoke to, is that you protect your children from the sun. If you can only get your kids to use a chemical sunscreen with a fragrance, then that's better than nothing. "We know ultraviolet light is a carcinogen. There's no doubt about it. There are some fears out there about ingredients, but that's all just kind of hypothetical, so what I like people to know is that we know for certain sun protection is important for your overall health and well-being," Fieleke said.