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What does the SPF number indicate?Updated a year ago

The SPF number on a sunscreen product indicates the level of protection it offers against UVB rays, which are the primary cause of sunburn. Here's what the numbers mean:

  • SPF 15: Provides protection against approximately 93% of UVB rays. 

  • SPF 30: Offers protection against about 97% of UVB rays. 

  • SPF 50: Blocks approximately 98% of UVB rays.

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