Sunscreen: One dose doesn't do it

By Mayo Clinic Staff

You can't put on sunscreen in the morning and expect to be protected for a full day in the sun. To maximize sun protection, apply generous amounts of sunscreen to dry skin 15 minutes before you go outdoors. Reapply sunscreen every two hours — or more often if you're swimming or sweating.

May 21, 2019 See more In-depth