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2. Sunscreen - Wikipedia

   en.wikipedia.org/wiki/Sunscreen

   Theoretically, a sunscreen with a PPD rating of 10 should allow a person 10 times as much UVA exposure as would be without protection. The PPD method is an in vivo test like SPF. In addition, the European Cosmetic and Perfumery Association ( Colipa ) has introduced a method that, it is claimed, can measure this in vitro and provide parity with ...

3. Ecamsule - Wikipedia

   en.wikipedia.org/wiki/Ecamsule

   Ecamsule (USAN, trade name Mexoryl SX, INCI terephthalylidene dicamphor sulfonic acid) is an organic compound which is added to many sunscreens to filter out UVA rays. It is a benzylidene camphor derivative, many of which are known for their excellent photostability.

4. 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.

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

   www.aol.com/lifestyle/does-sunscreen-expire-wear...

   Sunscreen sprays are not bad for you but it is important to use them properly. Ultimately, some sunscreen is better than no sunscreen, but either way it is important to ensure enough sunscreen is ...

6. The CDC’s advice for sunscreen and when to wear it, even in ...

   www.aol.com/cdc-advice-sunscreen-wear-even...

   The CDC recommends a shot glass of sunscreen to cover your whole body and about half a teaspoon for your face and applying sunscreen at least 20 minutes before exposure to the sun so it can be ...

7. Health effects of sunlight exposure - Wikipedia

   en.wikipedia.org/wiki/Health_effects_of_sunlight...

   [17] [18] [19] UVB radiation does not penetrate glass, so exposure to sunshine indoors through a window does not produce vitamin D. [20] Time of day, time of year, geographic latitude, ground altitude, cloud cover, smog, skin melanin content, and sunscreen are among the factors that greatly affect UV intensity and vitamin D synthesis, [19 ...