So. Does sunscreen work? It absolutely does reduce your risk of sunburn. That's crystal clear, because every commercial sunscreen is smeared on a person and the SPF is calculated by actually observing how much more ultraviolet light it takes to give that person a sunburn while they're wearing sunscreen.

Does wearing sunscreen really make a difference?

It turns out sunscreen does more than protect you from cancer and painful sunburns – it offers a boost to simple vanity. A new study finds that regular sunscreen use protects against photoaging: the wrinkling, spotting and loss of elasticity caused by exposure to the sun's ultraviolet radiation.

Is sunscreen 100% effective?

Properly applied SPF 50 sunscreen blocks 98 percent of UVB rays; SPF 100 blocks 99 percent. When used correctly, sunscreen with SPF values between 30 and 50 offers adequate sunburn protection, even for people most sensitive to sunburn.