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  2. We asked a dermatologist the most common questions about SPF ...

    www.aol.com/lifestyle/asked-dermatologist-most...

    Dr. Linkner: The most important part of a sunscreen label is the SPF or the sun protection factor level which gives you the interval time frame of which the sunscreen will prevent you from ...

  3. 3 dermatologists explain why you still need to wear sunscreen ...

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    The American Academy of Dermatology recommends using a sunscreen that offers a minimum protection of SPF 30, broad-spectrum coverage so it will properly defend against UVA and UVB rays, both of ...

  4. Sunscreen - Wikipedia

    en.wikipedia.org/wiki/Sunscreen

    High-SPF sunscreens filter out most UVB radiation, which triggers vitamin D production in the skin. However, clinical studies show that regular sunscreen use does not lead to vitamin D deficiency. Even high-SPF sunscreens allow a small amount of UVB to reach the skin, sufficient for vitamin D synthesis.

  5. Does sunscreen expire? Should you wear it indoors ... - AOL

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    According to the MD Anderson Cancer Center, an SPF 15 sunscreen blocks 93% of the sun’s harmful UVB rays, and SPF 30 blocks 97%. Once you get higher than that, you’re only getting a small ...

  6. Ultraviolet index - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet_index

    Reduce time in the sun between 10 a.m. and 4 p.m. If outdoors, seek shade and wear sun-protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 50+ sunscreen every 1.5 hours, even on cloudy days, and after swimming or sweating. Bright surfaces, such as sand, water, and snow, will increase UV exposure.

  7. A broad spectrum sunscreen with an SPF of 15 or higher is recommended by the CDC. The CDC also warns that sunscreen should be used alongside other protective measures, such as limiting time in the ...

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