由 很多事情的發展注定有個結束 於 2024-07-04 06:32:40 發表 | 累積瀏覽 84
Is SPF 70 too much for daily use? SPF 70 is not necessarily too much for daily use, but it may be more than most people need for everyday activities. The extra protection offered by SPF 70 compared to SPF 50 is minimal, blocking only about 0.6% more UVB rays.教育孩子
two hoursIn general, you should reapply sunscreen every two hours for consistent protection. However, there is an exception to the rule-if you're sweating or swimming you need to apply more often. To make sure you're protected even when you're active, you should reapply sunscreen at least every 80 minutes.
around 1⁄4 teaspoonWhen it comes to applying sunscreen on your face, the recommended amount is around 1⁄4 teaspoon. This may not seem like much, but applying enough is important to get adequate coverage.
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If studies showed that high SPF products were better at reducing skin damage and skin cancer risk, the extra chemical exposure might be justified. But they don't. So it's prudent to choose sunscreens with lower concentrations of active ingredients, for example SPF 30 instead of SPF 70.防曬推薦
SPF 30 or higher: The American Academy of Dermatology recommends that you select a sunscreen with an SPF rating of 30 or higher.
While any sunscreen is good because it protects your skin from UV exposure, SPF 70 only protects your skin from less than one percent more UVB rays than SPF 50 does. What SPF is best for tanning? Wearing a sunscreen slows tanning as well as burning, so the higher the SPF, the longer it will take you to tan.
Properly applied SPF 50 sunscreen blocks 98 percent of UVB rays; SPF 100 blocks 99 percent. When used correctly, sunscreen with SPF values between 30 and 50 offers adequate sunburn protection, even for people most sensitive to sunburn.
PA+ = Some UVA protection. PA++ = Moderate UVA protection. PA+++ = High UVA protection. PA++++ = Extremely High UVA protection.
And this is a skin cancer prevention measure that rings true year-round and in any weather condition, not just on sunny, summer days. It's why experts recommend wearing broad-spectrum sunscreen with an SPF of 30 or higher every single day, regardless of whether you plan to be out in the sun or not.