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Why Sunscreen Doesn't Work the Way You Think (SPF Explained)

SPF 50 isn't twice the protection of SPF 25 — here's what the number actually means Do you reapply sunscreen throughout the day or just put it on once?

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SPF 50 isn't twice the protection of SPF 25 — here's what the number actually means Do you reapply sunscreen throughout the day or just put it on once?

Transcript

SPF 50 isn't double SPF 25 — not even close. SPF measures the fraction of UV rays blocked, not potency. SPF 30 blocks about 97%, SPF 50 blocks 98% — barely a gap. The real move? Reapply every two hours. Follow for more.