Does Sunscreen Expire? What a 'No Date' Bottle Means
Can you use last summer's bottle? The FDA's actual rule settles it — and a hot car changes the answer.
The FDA requires sunscreens to retain their strength for at least 3 years; a sunscreen with no expiration date should be considered expired 3 years after purchase, and heat — like a hot car — degrades it faster.
The FDA states sunscreens must remain effective for at least three years, and Mayo Clinic clinicians advise discarding any product that has changed in color, consistency or smell — and storing bottles out of direct heat to preserve potency.
Questions we get a lot
How long is sunscreen good for if there's no date on it?
The FDA requires sunscreens to retain their strength for at least three years, so a bottle with no printed expiration date should be considered expired three years after you bought it. Writing the purchase date on the bottle makes this easy to track.
Does heat make sunscreen expire faster?
Yes. Exposure to high temperatures, such as leaving a bottle in a hot car or in direct sun, can degrade the active ingredients faster than the rated shelf life. Mayo Clinic advises storing sunscreen in a cool place and discarding it if the texture, color or smell changes.
Is expired sunscreen dangerous, or just less effective?
The main risk is reduced protection — an expired sunscreen may not provide its labeled SPF, leaving you more prone to burns and UV damage. The FDA recommends not relying on a product past its effective window. When in doubt, replace it.
r/SkincareAddiction: 'Found a half-used sunscreen from two summers ago in my beach bag — is it still safe to use?'