Which SPF should I use?

30? 50? SPF?

The American Academy of Dermatology recommends using sunscreen with an SPF of at least 30. This blocks 97% of UVB rays.

An SPF higher than 30 gives you limited amount of return.

An SPF 50 doesn't give you 50 times the protection.

It gives you a minimal amount more than the 30.

So sticking with the 30 is sufficient.

You just have to keep reapplying.

Especially if you are out exercising you should reapply sunscreen every 2-3 hours.

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