If you've stashed your sunscreen in a hot car all year, buy a new bottle. Here's why
Briefly

As summer approaches, it's crucial to replace old sunscreen as it can degrade from heat and light exposure. Sunscreens regulated by the FDA have expiration dates, typically lasting at least three years unopened; however, improper storage can diminish their effectiveness. Chemical sunscreens are particularly prone to degradation. It's advised to avoid expired products as their active ingredients lose potency, making them inadequate for protection against harmful UV rays. Proper storage away from heat and light can extend sunscreen's lifespan, but the best practice is to renew it each summer for optimal protection.
Sunscreen has an expiration date and can degrade in heat. Toss old sunscreen and replace with new each summer for best protection.
Chemical sunscreens degrade faster than mineral ones and are less effective if stored improperly, even if within the expiration date.
Active ingredients in sunscreen break down due to heat and light exposure; using expired sunscreen can lead to inadequate protection.
Store sunscreen in a cooler place to prolong efficacy, and replace it every summer to ensure optimal sun protection.
Read at Miami Herald
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