Which SPF sunscreen is best?
SPF 30 is the most common level for most people and skin types. No sunscreen can block all UV rays, but what we do know is: SPF 15 blocks 93% of UVB rays, SPF 30 blocks 97% of UVB rays and SPF 50 blocks 98% of UVB rays.
SPF 30 means 97% of UVB rays are blocked. SPF 50 means 98% of UVB rays are blocked. SPF 70 means 98.5% of UVB rays are blocked. SPF 100 means 99% of UVB rays are blocked. Notice that once you hit an SPF of 10 then 90% the percent of UVB rays blocked.
- sun protection factor
- sun protection factor
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"Tanned skin is damaged skin." "Imagine that your skin normally begins to burn after 10 minutes in full sun without any protection. A 30 SPF sunscreen would provide 30 times the protection of no sunscreen." That means 30 times longer before you start to burn, or in this case, 300 minutes.
- Sunscreens should be applied 30 minutes before sun exposure to allow the ingredients to fully bind to the skin. Reapplication of sunscreen is just as important as putting it on in the first place, so reapply the same amount every two hours.
- PA+ means the sunscreen can provide UVA protection with factor of Persistent Pigment Darkening (PPD) between two to four. It can provide the protection of medium UV radiation. Sunscreen labeled with PA++ can provide moderate protection against UVA rays with a factor of PPD between four and eight.
- There are two types of UV light that can harm your skin — UVA and UVB . A broad-spectrum, or full-spectrum, sunscreen protects you from both. UVA rays can prematurely age your skin, causing wrinkling and age spots. UVB rays can burn your skin. Too much exposure to UVA or UVB rays can cause skin cancer.
The number doesn't indicate how long a person can be outside in the sun before suffering from a burn. To give you an idea of what the numbers mean, an SPF 15 sunscreen blocks 94 percent of UVB rays, SPF 30 blocks 97 percent, SPF 50 blocks 98 percent, and SPF 100 blocks 99 percent.
- “Of course you can still get tan while wearing sunscreen,” Serrador says. “It all depends on the strength of the SPF.” There is no sunscreen that will block 100 percent of UV rays, so your skin—especially if it burns easily—may still get some color even with it on, just at a slower rate.
- Sunscreen protects every skin type. If you have a darker complexion, the melanin in your skin confers some natural protection from sunburns, but you still need protection from harmful ultraviolet rays. The American Academy of Dermatology recommends that EVERYONE wear sunscreen daily for the safety of their skin.
- The Answer: All sunscreens have an expiration date printed on the bottle. Typically they last a year or two, and most are good for three years. The safest bet, naturally, is to ditch old product and replace it. But in a pinch, here's a secret: Sunscreen is still good for six months beyond its expiration date.
Updated: 3rd December 2019