Check to see if your bottle of sunscreen is stamped with an expiration date. If you don’t see a date, the rule of thumb is that the active ingredients in sunscreen (like zinc, titanium dioxide and Parsol 1789) should remain stable and effective for about three years. But if it smells funny, feels lumpy or has a strange color, dump it. To keep your sunscreen as close to new as possible, store it in a dry spot at room temperature with the lid tightly fastened.
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