Understanding SPF: Does SPF 50 Equal 500 Minutes of Protection?

Learn the truth about SPF 50 and sun protection duration. Clarifying how long sunscreen really lasts and when to reapply.

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SPF 50 does not mean 500 minutes of protection. SPF stands for Sun Protection Factor and indicates the level of protection against UVB rays. SPF 50 means it will take 50 times longer for your skin to burn than it would without sunscreen. However, regardless of SPF, sunscreen should be reapplied every two hours, or more often if swimming or sweating, to maintain its effectiveness.

FAQs & Answers

  1. How often should I reapply sunscreen? You should reapply sunscreen every two hours, or more frequently if swimming or sweating.
  2. What does SPF stand for? SPF stands for Sun Protection Factor, indicating the level of protection against UVB rays.
  3. Does higher SPF mean longer protection? Not necessarily; while higher SPF offers more protection, it's crucial to reapply it regularly to maintain effectiveness.
  4. What is the difference between UVB and UVA rays? UVB rays primarily cause sunburn, while UVA rays penetrate deeper and contribute to skin aging and cancer.