![]() Wang MD, chair of The Skin Cancer Foundation’s Photobiology Committee and director of dermatologic surgery and dermatology at Memorial Sloan Kettering Cancer. ![]() “And if you extend that over a lifetime, that's an enormous amount of damage,” says dermatologist Steven Q. For example, SPF 15 still lets seven percent of UVB rays through while SPF 100 only lets one percent through, meaning your skin is being exposed to seven times the amount of UVB rays if you use a lesser SPF number. While that six percent difference doesn’t seem too drastic, it's the difference between the amount of rays that are getting through over time that can add up. To break it down even further, SPF 15 is said to block 93 percent of UVB rays whereas SPF 100 blocks around 99 percent. Play icon The triangle icon that indicates to play “For example, if you typically burn after 15 minutes of sun exposure, applying an SPF of 50 means that it will take 50 times longer for you to burn in the sun," explains dermatologist Orit Markowitz MD, the Director of Pigmented Lesions and Skin Cancer at Mount Sinai. SPF, short for sun protection factor, is a term that hit the skincare scene in the early 1960s as a way to measure a sunscreen’s effects against UVB light. Below, we’ve rounded up your most burning questions to help you understand what’s fact and what’s fiction about proper sunscreen practices and whether or not you should have SPF 100 in your beach bag: The SPF number indicates how long you can stay in the sun without getting burned. The reason? If you have a clear understanding of how sunscreen protects your skin, then you’ll have more success in keeping sun damage at bay. One of the most important thing to know before buying sunscreen is how the number rating system works. But a study done in 2018 and published in the Journal of the American Academy of Dermatology found that "SPF 100+ sunscreen was significantly more effective in protecting against sunburn than SPF 50+ sunscreen in actual use conditions."Įven with this knowledge, it’s still a heated topic (no pun intended) among dermatologists. While you can’t fault them for practicing sun safety, it’s normal to wonder if wearing SPF 100 is really necessary - especially since it feels like every summer there’s conflicting advice on what level of SPF is sufficient enough. Glodny says, "whether or not these chemicals clinically affect our hormonal profile has yet to be proven." (But if you're still wary, stick to a mineral formula in a non-aerosol spray bottle, which we've included a few options for below like EltaMD UV AOX Mist Broad Spectrum SPF 40).Everyone has that friend who compulsively applies the highest SPF they can find on anytime they step outside. "Instead, spray the sunscreen on your hands first and then apply it to your face," she advises.Īs for the possible endocrine disrupters in spray-on chemical sunscreens, Dr. Marmur also advises against spraying sunscreen directly on your face for this same reason. ![]() Marmur agrees, adding that "generally the ingredients in spray sunscreens are safe for your skin, but they can be irritating to the lungs if inhaled, so I always apply spray sunscreens outdoors." Dr. That said, spray formulas can have certain irritants or cause allergic reactions for some people," (which is why we always advise doing a patch test of any new skincare product before applying it all over).ĭr. "Spray sunscreen is absolutely safe to use.
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