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A member asked:
What's the difference between sunscreen with spf 25 and spf 50+? which one i should use?
A doctor has provided 1 answer
SPF 25 is fine.: The SPF refers to how much time one can spend in the sun without burning, on average of course. Typically we'd burn in ~10 minutes without any sunscreen. SPF x 10 then gives us the time we can spend with sunscreen. So SPF 25 gives us ~250 minutes, or ~4 hours. SPF 50 would give us ~500 minutes (~8.5 hours). For practical purposes, then, SPF 25 is usually high enough.
Answered 11/30/2016
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