Chemical vs mineral sunscreen: mineral is gentle and works instantly; chemical blends clear but needs 15 minutes. Which is better for your skin, explained.

How often should you reapply sunscreen? Every 2 hours outdoors, and right after swimming, sweating, or towel-drying. The full reapplication guide.

Does sunscreen expire? Yes, about 3 years unopened. How to tell if yours is expired, why it matters for protection, and how to store it so it lasts.

Most people apply far too little sunscreen. Here’s the exact amount for your face and body, with a calculator.