The Effects of Zinc Oxide on Skin Protection

Perry: I hate to throw out sunscreen if it's an SPF 50 because I'm hoping it still has some protection. If the bottle is unopened, sealed, unexposed to air, does it matter if it's old? Can I still use it? Perry: As far as SPF 50 turning into a 30, there's no linear degradation like that. You're going to have spots where it's 50 and then spots where it’s zero. And so now you're going to look like Captain Marvel. Like Captain Marvel, the new little kitty with the marbly banded face mask or something.

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