Sunscreen might be one the best tools you have to protect your skin from the dangerous UV rays of the sun. Using sunblock properly lowers the risk of skin damage and premature aging β€” not to mention ... MSN: How to Tell if Your Sunscreen Is Expired (And Save Your Skin From Future Sun Damage) Sunscreen is expensive, but there's no value in keeping an expired SPF.

Understanding the Context

Truth: If you use sunscreen often and apply (and reapply!) generously, you should run through the bottle pretty quickly. But, if ... How to Tell if Your Sunscreen Is Expired (And Save Your Skin From Future Sun Damage) The Desert Sun: Many sunscreens offer way less protection than advertised. So which ones work?

Key Insights

Ready to head to the beach or a backyard barbecue? Many sunscreens, despite their advertised numbers, provide just a quarter of necessary protection from ultraviolet rays. That’s according to the ... Many sunscreens offer way less protection than advertised. So which ones work?

Final Thoughts

Popular Science: How to tell if your makeup, shampoo, or sunscreen has gone bad