If a new skincare ingredient came out tomorrow and studies showed it could reduce your risk of the most common type of cancer by 40%, people would be lining up around the block. But we’ve had that product all along. Most people think of sunscreen as just a product you bring out when you’re heading off to the beach for the day. While it absolutely helps prevent premature aging, sunspots, and collagen breakdown, its most important job is protecting your skin from UV damage that can lead to skin cancer.