3 Things to Know About SPF 30 vs. SPF 50

The protection difference is tiny SPF 30 blocks about 97% of UVB rays, while SPF 50 blocks about 98%. That is only a 1% difference in lab tests.

Real-world use makes the number irrelevant Most people do not apply enough sunscreen, do not reapply, and sweat or rub it off. That theoretical 1% edge is easily lost to human error.

Using enough and reapplying matters more Focus on using a full shot glass amount for your body and reapplying every two hours. That makes a far bigger difference than choosing a higher SPF number.