This advice comes straight from the FDA, which asks sunscreen makers to put an expiration date on their product showing when it will stop providing the level of protection shown on the label. If there’s no date, that means testing showed it should be good for a full three years after purchase. (This is a longstanding rule that is not related to the current administration—it's been in place for years.)
How to make your sunscreen last the full three years
Expired sunscreen may not look or feel any different from fresh, but if it does look different, that may mean it's gone bad prematurely. Sunscreen needs to stay in its original formulation to remain effective. For example, if it initially had the protective chemicals evenly suspended in the lotion but has since separated, it's not going to be as effective anymore. If you squeeze the bottle and what you get is a separated goo and liquid, it's probably not good anymore.
The way you store sunscreen can affect how long it lasts. The FDA recommends, ironically, that we keep sunscreen bottles out of the sun. Extreme heat could cause the product to deteriorate early, so they suggest you leave your sunscreen in the shade or wrap it in towels when you’re at the beach. You can also put it in a cooler to be extra safe.
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