That tiny jar symbol on your sunscreen isn’t just decoration—it tells you exactly how many months your formula stays effective after opening. Most sunscreens last 6 to 12 months once unsealed, but heat, humidity, and improper storage can cut that short. Here’s how to read the label and spot a bottle that’s past its prime.
Zinc oxide has shed its lifeguard-nose reputation to become the mineral filter dermatologists and beauty experts actually recommend daily. Modern formulations eliminate the white cast while delivering superior broad-spectrum protection—here’s exactly what to look for and how to make it stick.
The sunscreen sitting in your bathroom cabinet since last summer isn’t just old—it’s likely providing almost zero protection while giving you dangerous false confidence. Chemical filters degrade rapidly in heat, and expired sunscreen can be worse than using nothing at all because you think you’re protected when you’re not.
