When it comes to exercising, there's strength in numbers, but that's not necessarily true when the subject is sunscreen. Compared to your 50 SPF sunscreen, one that has 100 SPF might give the impression that your product is inadequate. According to dermatologists interviewed by The New York Times, swapping out your 50 SPF for the 100 isn't a necessary move.

Sunscreen brands have been consistently raising the SPF bar. Coppertone started it with last year's groundbreaking launch of SPF 70+, followed by the introduction of SPF 85 from Neutrogena and Banana Boat, and most recently Neutrogena's 100 SPF sunblock. The numbers cause consumer confusion, but Dr. David M. Pariser, the president of the American Academy of Dermatology, says, "As you get higher and higher, it’s not really a practical difference."

To learn what is truly important about sunscreen, read more.

The Times points out the marginal difference in UVB protection: SPF 100 blocks 99 percent of UVB rays, SPF 50 blocks 98 percent, and SPF 30 protects against 96.7 percent of UVB rays. Some doctors argue that ditching your bottle of 30 or 50 for a higher SPF could lead to a false sense of security about staying in the sun longer without reapplying.

Dermatologists suggest that, rather than becoming consumed with the SPF number, it's more important to focus on wearing enough sunscreen. A full shot glass of the stuff should do the trick. What else do you know about sunscreen?


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