Beauty Shelf Life: How Long Do Skincare Products Last After Opening?
September 30, 2026You find an old serum at the back of the bathroom cabinet. It smells fine. It looks fine. Can you still use it? This is where expiry dates, PAO symbols and storage instructions become much more useful than guessing.
Expiry date vs PAO
The expiry date tells you the manufacturer's stated period of suitability under the specified storage conditions. The open-jar symbol, known as Period After Opening or PAO, indicates how long the product is intended to be used after opening where that marking applies. A symbol such as 12M means 12 months after opening.
Why opening matters
Once opened, products can be exposed to air, light, moisture and environmental contamination. Packaging affects exposure too. A pump dispenser can offer a different level of protection from an open jar that is repeatedly touched.
Does natural or organic skincare expire?
Yes. Natural and organic ingredients are not immune to degradation. Water-based botanical products can also require careful preservation and storage. JC's hydrosol article provides specific guidance for storing delicate hydrosols.
Signs a product has changed
Watch for an unexpected odour, significant colour change, separation, altered texture, gas formation, damaged packaging or irritation that was not previously present. Botanical products can sometimes vary naturally, so not every small change means spoilage, but a major unexpected change deserves caution.
How to store skincare
Keep products away from excessive heat and direct sunlight, close containers properly and follow the manufacturer's storage instructions. Avoid introducing water or unclean tools into open jars.
Can skincare be refrigerated?
Only if the product or manufacturer recommends it. Cold storage is not automatically better for every formula and extreme temperature changes can affect some products.
The simplest rule
Check the expiry date, PAO, storage instructions and product condition. If a product is clearly past its intended life or has changed unexpectedly, replacing it is safer than trying to rescue it.
Recommended internal links
hydrosol article | beauty blog library
FAQs
Q: What does 12M mean on skincare?
A: It generally means the product is intended to be used within 12 months after opening, where the PAO symbol applies.
Q: Does unopened skincare expire?
A: Yes. Unopened products still have a stated shelf life and expiry information where applicable.
Q: Can I use skincare after the PAO period?
A: It is best to follow the manufacturer's stated PAO and expiry guidance rather than relying on appearance or smell alone.
Q: Why does natural skincare change colour?
A: Botanical ingredients can sometimes vary naturally, but a major unexpected change can also indicate degradation. Check the product guidance and contact the brand if unsure.
