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Q: If my moisturizer contains broad-spectrum SPF 30, do I need to apply sunscreen on top of it?
No, your moisturizer will help protect you from skin cancer and the photodamage that causes aging. And if it also contains brightening and softening antioxidants, amino acids, and peptides, you'll get a trifecta of healthy skin benefits. If you're going to be outside for a prolonged period, you must reapply sunscreen every couple of hours. Instead of remoisturizing, try dusting on a mineral sunscreen powder to get the protection you need, says Ellen Marmur, MD, associate clinical professor of dermatology at the Mount Sinai Hospital in New York City.