4 Signs Your Sunscreen Has Expired

Check the expiration date Look for a printed expiration date on the bottle. If there is none, mark the purchase month with a Sharpie and toss it after three years.

Smell for off odors If the sunscreen smells like old Play-Doh or has a chemical sting to your nose, it has degraded and is no longer effective.

Inspect the texture Chunky, watery, or separated sunscreen that won’t mix back together when shaken is expired and should be thrown away.

Consider temperature damage If the sunscreen ever froze or sat in a hot car, the active ingredients have likely broken down, even if it looks and smells fine.