Does sunscreen go off? When should you replace it?
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A morning at the beach, your bag already packed and a bottle of sun cream left over from last summer: is it still any good? The short answer is yes, sun cream does expire. Once the use-by date has passed, or the recommended period after opening has elapsed, the formula may no longer provide the protection stated on the label.
This doesn’t mean you should throw a product away just because you bought it a few months ago. What matters is the date indicated, how long it’s been open and, above all, how it’s been stored. Intense heat, direct light and temperature fluctuations can compromise the stability of the formula sooner.
Key points
- Always check the expiry date and the PAO symbol, which indicates how many months the product should be used for after opening.
- Sunscreen that has passed its expiry date may not provide the level of UV protection stated on the packaging.
- Changes in smell, colour, texture or separation of the formula are reasons not to use it, even if it is still within its use-by date.
- Storing the sun cream in a cool, dry place away from direct sunlight helps to preserve the formula.
- If in doubt, especially before prolonged sun exposure, the safest option is to use a product that is within its use-by date and in good condition.
In this article
- What does the expiry date on a sun cream mean?
- How to check if it is still fit for use
- What happens when sun cream expires
- How to store it correctly
- Common mistakes and how to avoid them
What does the expiry date on a sun cream mean?
The expiry date is not just a formality on the packaging. The UV filters and other ingredients in a sun cream are tested to ensure they maintain their stability, texture and performance for a defined period. After this date, you can no longer be sure that the product provides the sun protection factor, or SPF, stated on the label.
You’ll find two indications on the packaging. The first is an expiry date, usually accompanied by the month and year or a phrase such as ‘use by the end of’. The second is the symbol of an open jar with a number and the letter M, for example, 12M. This is the PAO, or period after opening, and means that the product should be used within 12 months of opening.
If your sunscreen has both pieces of information, go by whichever expires first. For example, if the PAO is 12 months but the use-by date is within eight months, you should follow that date. If you can’t remember when you opened it, check the condition of the product and avoid keeping it from one season to the next without checking.
Does the use-by date apply to an unopened product?
Yes. An unopened sun cream can remain stable until the printed date, provided it has been stored correctly. However, ‘unopened’ does not mean ‘immune to heat’. A bottle left in a car for several hot days, for example, may deteriorate before the expected date.
Once opened, the product comes into contact with air, moisture and any residue that may remain in the packaging. This is why the PAO is particularly useful for formulas used on the face and body throughout the year.
How to tell if your sun cream has gone off or changed
The expiry date is the most reliable indicator, but there are visible signs that are also worth noting. You don’t need to carry out tests at home or apply a large amount to your skin to tell if the formula has changed.
Take a look at the product’s appearance when you dispense it. A slight difference in consistency may occur depending on the ambient temperature, but a persistent separation between liquid and cream, lumps or an unusually gritty texture are signs that you should not use it. A smell that is significantly different from usual and a change in colour also warrant replacement.
Shaking the bottle may help to homogenise some fluid formulas, but it won’t restore a product that has gone off. If it remains separated or looks strange after shaking, it’s not worth risking sun exposure with that bottle.
What happens when sun cream goes off?
An out-of-date sun cream does not automatically become dangerous, but its protection is no longer reliable. Over time, the formula may lose its uniformity and the UV filters may no longer be distributed as intended. In practice, applying the product may not provide the SPF you expect.
This is particularly relevant on days spent at the beach, hiking, doing outdoor sports, in the snow or spending long periods near windows. UV exposure builds up over time, so using a sunscreen in good condition should be a consistent part of your routine, rather than something reserved for the hottest days.
If you have applied an out-of-date sun cream once, there is no cause for alarm. Remove it as part of your usual cleansing routine and use a sun cream that is within its use-by date if you remain exposed to the sun. If you experience persistent skin discomfort after applying any product, stop using it and seek advice from a healthcare professional.
Can heat cause sun cream to go off more quickly?
It can affect the stability of the formula. Sunscreens are designed to withstand normal use in summer, but repeated exposure to high heat and direct sunlight whilst still in the packaging is not the same as occasional use on the beach.
Leaving the product in the car, on a towel for hours or on a very hot windowsill can alter the emulsion – that is, the mixture that keeps the ingredients evenly distributed. This applies to sunscreens in cream, lotion, stick or spray form, although the signs of deterioration may differ.
Ideally, carry it in a bag and keep it in the shade when not in use. At home, store it in a cool, dry drawer or cupboard. The bathroom isn’t always the best place, as steam and temperature fluctuations can be frequent.
How to store sun cream so it lasts as long as intended
A simple storage routine reduces waste and helps you make the most of the product whilst it’s still within its use-by date. Close the lid tightly after each application and wipe away any excess product that has built up on the dispenser or the screw cap. This prevents the packaging from becoming sticky and more exposed to impurities.
Avoid diluting the sun cream with water, or mixing it with make-up or your moisturiser in your hand. As well as making application less predictable, these mixtures can prevent you from forming an even layer on your skin. If you wish to use a serum, moisturiser or make-up, apply each product separately and allow the previous product to settle before applying the sun cream.
It’s also worth choosing a size that suits your actual usage. For those who apply sun cream daily to their face, neck and exposed areas, an opened tube tends to be used up within the PAO. If you only use it on specific occasions, check the expiry date before each season of increased sun exposure.
Common mistakes when using old sun cream
There are some habits that seem harmless but make it harder to tell whether the product is still in good condition:
- Using the bottle ‘right to the end’ without checking the expiry date or the PAO.
- Storing the sun cream in the car, in a beach bag or exposed to the sun for weeks on end.
- Assuming that simply shaking a separated product is enough to restore the formula.
- Carrying on using sun cream that has changed in smell, colour or texture simply because the bottle isn’t empty yet.
- Buying several bottles to stockpile, without knowing when they’ll be opened and used.
When to replace your sun cream
Replace it when it has passed its use-by date, when it has exceeded the PAO, or when it shows clear signs of change, even if the date hasn’t yet arrived. It also makes sense to replace a product whose storage history you’re unaware of, such as an old bottle found in a drawer or given to you by someone.
When disposing of a container, check your local authority’s recycling guidelines and empty the product whenever possible. Then, start the new container by making a small note of the opening date, written on a label or on the bottom of the bottle. It’s a simple step that will save you any uncertainty in a few months’ time.
The best sun cream is one that fits into your routine, that you apply regularly, and that is within its use-by date, well preserved and pleasant to use. Paying attention to these details helps make daily sun protection a simple choice for your skin.