19/06/2025
Sun protection factor (SPF) measures how much solar energy is required to cause a sunburn when you’re wearing sunscreen compared with unprotected skin. A sunscreen with an SPF of 30, when used as directed, prevents 97% of UVB raysTrusted Source from reaching your skin. It’s important to remember that while higher SPFs offer more protection, they don’t last any longer than lower numbers, so you need to reapply them just as often.
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