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Everything you need for skin well-protected from the sun is inside any mineral or chemical sunscreen with SPF 30 or higher sun protection factor. But ultimately, how well your skin is defended from sun damage depends heavily on applying and reapplying enough product.

To get the protection labeled on the product, you would need to replicate the application they do in the lab, which is 2 milligrams per square centimetre for the average person. That translates to half a teaspoon on the face and neck combined, a quarter teaspoon each, and 1 teaspoon per arm and leg each, front and back.

Needless to say, we could all use a reminder about how much sunscreen to use and why. Here's what the experts have to say about application, reapplication, and all of the variables that come into play, like SPF level, being indoors, and more.


What about SPF level?

The amount of product you apply is extremely important, but so is the SPF number. And you'll be hard-pressed to find a dermatologist that will tell you anything under SPF 30 is sufficient enough to truly protect skin from discoloration, collagen breakdown, and skin cancer.

A common inaccuracy that is still widely shared is that because SPF 30 filters 97 percent, SPF 50 blocks 98 percent of rays, and SPF 100 about 99 percent, there is little difference between them. If you put it in a different way, by going from SPF 30 to SPF 50, you get 1.5 times the UV getting through the filter, so there is a meaningful difference between SPF 30 and 50.

Source: HealthDigest

In addition to seeking out a high SPF number, make sure the sunscreen you select is indicated as broad-spectrum. That means it protects against both UVB and UVA rays. 


How important is reapplication?

In a word: very. And for the most part, it should be happening pretty frequently.


Reapply every two hours at a minimum but more often if sweating or emersed in water. 

And yes, reapplication is important indoors, too — especially if you spend any amount of time in a room with natural light.

And remember, you're not just protecting yourself against UVA rays when you're indoors. While the majority of blue light exposure is from the sun, our digital devices emit high-energy visible light, and some sunscreens may offer protection against this.

And finally, don't forget that sunscreen is the most essential piece of the sun-protection puzzle, but not the only one. It is also important to remember other sun-protective strategies, including seeking shade, wearing a wide-brimmed hat and sun-protective clothing, and avoiding peak hours of UV exposure.


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