They’re also a better choice for anyone who has heat-sensitive skin disorders like melasma since, according to Dr. The shorter ingredient list means less of a risk of irritation. “Physical formulas require fewer ingredients to achieve broad spectrum coverage than chemical blockers,” says Dr. Sensitive skin types may prefer physical sunscreens. “I advise to purchase at least SPF 30 sunscreen, with the knowledge that higher SPFs do a better job at protecting against sunburn,” he continues. Lain, what matters even more in terms of protection, isn’t the type of sunscreen you choose, but the level of SPF. Since physical sunscreens have active mineral formulations they provide instant protection whereas chemical sunscreens require you to wait 20 to 30 minutes before sun exposure. “However, many sunscreens now have stabilizing ingredients to make up for that.”Īnother thing to factor into your decision is how quickly physical and chemical SPFs begin to work. “Chemical blockers tend to degrade quicker when exposed to UV as compared to the physical blockers,” explains dermatologist Ted Lain, MD. While they both shield against UVA and UVB rays, chemical and physical SPF differ in terms of how long their protection lasts. Physical sunscreens may last longer than chemical ones. Peredo says to “think of chemical sunscreen like a sponge it absorbs the sun's rays before they can harm the skin.” Chemical formulas consist of organic, carbon-based compounds like oxybenzone, avobenzone, octinoxate and octisalate. “Whereas chemical sunscreens are molecules that sink into skin to absorb ultraviolet rays, turning the energy into heat that is then dissipated.” Dr.
“Mineral sunscreens are considered physical blockers (look for zinc oxide and titanium dioxide) because they sit on the surface of the skin and work by reflecting away ultra-violet rays,” says Jacqueline Berliner, M.D., a dermatologist in NYC. Chemical sunscreens absorb sun rays while mineral sunscreens reflect them away. Below, find the derm-approved answers to all your biggest SPF questions, so you don’t get burned by the wrong decision. Once you understand how they vary, it’s easier to choose a bottle that’s suited for your needs and lifestyle. This is exactly why the most effective way to navigate the sunscreen aisle is to know your sun protection basics, namely the difference between chemical and physical sunscreen. Play icon The triangle icon that indicates to play
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