How Much SPF Do You Need In Your Sunscreen?
How Much SPF Do You Need In Your Sunscreen?
2018年6月6日
utexas.edu
Here’s what the SPF number on your sunscreen actually means — and why it might be fooling you. Most people think SPF 30 means full protection from the sun. But that’s not how it works. SPF 30 means you can stay in the sun 30 times longer without burning. If it usually takes you 20 minutes to burn, SPF 30 gives you about 600 minutes — that’s 10 hours. But here’s what no one tells you… SPF only blocks UVB rays — the ones that cause sunburn. It does not block UVA rays. And UVA is the real danger. I
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