5 Things to Know About SPF 100 Sunscreen

SPF 100 blocks only about 99% of UVB rays, while SPF 50 blocks about 98%. That extra 1% is negligible in real-world use.

People often treat SPF 100 as a force field, skipping reapplication or staying out longer. No sunscreen lasts all day, regardless of the number.

You are better off with SPF 50 that you reapply every two hours than SPF 100 you apply once and forget. Proper reapplication matters more than the SPF number.

SPF 100 sunscreens often contain more chemical filters or higher concentrations, which can irritate sensitive skin more than lower SPF options.

SPF 100 costs more than SPF 50 without providing meaningfully better protection. The best sunscreen is the one you reapply properly.