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Did you know that SPF does not express a specific amount of sun protection, but rather suggests how long it will take for skin to redden in comparison to skin without sunscreen? Let's take an SPF of 15, for example: On average, it would take up to 15 times longer for skin to show signs of sun damage, a.k.a. redness, than it would without any SPF. Keep in mind, that you should reapply sunscreen at least every two hours regardless of SPF.
Sunburn is primarily caused by UVB rays while UVA rays are responsible for premature aging. Therefore, SPF measures the amount of UVB rays being blocked. To protect yourself against UVA radiation and premature aging, look for sunscreens labeled as broad spectrum.
Sunburn is primarily caused by UVB rays while UVA rays are responsible for premature aging. Therefore, SPF measures the amount of UVB rays being blocked. To protect yourself against UVA radiation and premature aging, look for sunscreens labeled as broad spectrum.
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