The safest sunscreens to buy—and which ingredients to avoid ☀️
There are two basic types of sunscreen: physical and chemical.
Physical sunscreens, which are also known as mineral sunscreens, sit on top of the skin and block UV rays. “They are instantaneously effective,” says Dr. Julie Karen, a dermatologist and spokesperson for the Skin Cancer Foundation; users don’t have to wait the 15 minutes or so that chemical sunscreens require before the ingredients offer full protection.
The main downside of physical sunscreen, Karen explains, is that it can leave a chalky or pasty appearance on the skin. Chemical sunscreen solves that issue because it is absorbed into the skin, where it then absorbs ultraviolet light and converts it to non-damaging heat. There are currently about 16 chemical blockers approved for use in the United States, and many more than that in other countries.
“The chemical sunscreens are much more elegant,” says Karen, though both can be effective at blocking short- and long-wave ultraviolet light.Many dermatologists say that the best sunscreen is the one people will tolerate and actually use. But there are open questions about the human and environmental health impacts of chemical sunscreens.
The chemical that has perhaps garnered the most attention is oxybenzone. “That is the one that is shown to have the most penetration,” says Dr. Henry Lim, a dermatologist at the Henry Ford Medical Center and former president of the American Academy of Dermatology. “And it’s the one that’s been shown to have the most environmental effect.
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