PAO Symbol Explained: 6M, 12M, 24M & Cosmetic Expiry
Have you ever noticed a tiny open-jar symbol on the back of a face cream, serum, shampoo or makeup product?
It usually contains a number followed by the letter M, such as 6M, 12M or 24M.
Many shoppers mistake this marking for an expiry date. Others assume that a cosmetic without a printed expiration date must be old or incorrectly labelled.
Neither assumption is necessarily correct.
European cosmetics use different durability information depending on the product's characteristics and regulatory requirements.
Understanding these markings helps you manage your skincare and makeup collection, reduce unnecessary waste and recognise when a product should no longer be used.
QUICK ANSWER
TL;DR
The PAO symbol stands for Period After Opening. An open-jar symbol marked 12M indicates that the cosmetic is intended to remain safe for use for 12 months after opening under appropriate conditions. It does not mean the product was manufactured 12 months ago or that it expires 12 months after purchase. European cosmetics may instead carry a minimum-durability date, depending on their shelf life. A batch code is primarily a traceability reference, not a universal expiry-date code.
UNDERSTANDING THE SYMBOL
What Does PAO Mean on Skincare and Makeup?
PAO means Period After Opening.
It identifies the period during which a cosmetic product can be used safely after opening, provided the product is handled and stored appropriately.
The marking normally appears as an illustration of an open cosmetic jar with a number and the letter M.
Six Months
Indicated period after opening: 6 months.
Twelve Months
Indicated period after opening: 12 months.
Twenty-Four Months
Indicated period after opening: 24 months.
These are examples, not mandatory PAO periods for particular product categories. The actual marking depends on the product.
IMPORTANT DISTINCTION
PAO Is Not the Same as an Expiry Date
Imagine buying a face cream in October 2026.
The product carries an open-jar symbol marked 12M.
If you first open it in November 2026, the indicated period after opening runs from that opening date—not automatically from the date of purchase.
This example assumes the unopened product remained suitable for use and was stored under appropriate conditions.
A PAO marking should never be used to justify keeping a product that has visibly deteriorated or is otherwise known to be unsuitable for use.
EUROPEAN COSMETICS REGULATION
Why Do Some European Cosmetics Have No Printed Expiry Date?
The European Union regulates cosmetic durability labelling through Regulation (EC) No 1223/2009, Article 19.
The regulation distinguishes between a cosmetic's minimum durability and its period after opening.
| Product Durability | Relevant Labelling |
|---|---|
| Minimum durability of 30 months or less | Minimum-durability date, using the required wording or symbol. |
| Minimum durability exceeding 30 months | A minimum-durability date is not mandatory; PAO information is generally required unless the concept of durability after opening is not relevant. |
This explains why two legitimate European cosmetic products may display different durability markings.
The absence of a conventional expiry date is therefore not, by itself, evidence that a product is counterfeit, expired or non-compliant.
Regulatory reference: Regulation (EC) No 1223/2009 .
What Does “Best Used Before the End Of” Mean?
A minimum-durability date indicates the date until which a cosmetic product, when stored under appropriate conditions, is expected to continue fulfilling its original function and meet the applicable safety requirements.
European packaging may show this information using an hourglass symbol or wording equivalent to “best used before the end of”.
The date may be expressed as a month and year or a full day, month and year.
Do not confuse this fixed date with a PAO period, which relates to use after opening.
BATCH CODES
Can a Batch Code Tell You When a Cosmetic Expires?
Not reliably without the manufacturer's coding information.
A batch code identifies a manufacturing batch or provides another reference used for product traceability.
Some manufacturers may encode production information into these references, but there is no universal format that lets every consumer decode every cosmetic batch number.
Third-party batch-code websites may provide estimates, but their results should not automatically be treated as authoritative.
If you want to understand the wider information printed on European packaging, read our guide: How to Read a European Cosmetics Label .
PRODUCT CARE
Storage Conditions Matter More Than Many People Think
The PAO period assumes appropriate handling and storage.
A product repeatedly exposed to heat, direct sunlight, moisture or contamination may deteriorate before the end of its indicated period.
DIFFERENT PRODUCT FORMULAS
Do All Beauty Products Last the Same Amount of Time?
No. Shelf life and durability after opening depend on the formulation, packaging, preservation system and conditions of use.
A sealed pump bottle, an open jar, a powder product and a product used around the eyes may have different contamination and stability considerations.
The table below explains what shoppers should pay attention to. It does not assign universal expiry periods to entire product categories.
| Product Type | Practical Consideration |
|---|---|
| Face creams in jars | Repeated contact with fingers or applicators makes hygiene important. |
| Serums in dropper bottles | Avoid touching the dropper directly to skin. |
| Mascara and liquid eye makeup | Pay particular attention to hygiene, contamination and manufacturer instructions. |
| Powder makeup | Keep brushes and applicators clean and avoid introducing moisture. |
| Shampoo and body wash | Close containers properly and avoid diluting products with water. |
| Sunscreen | Follow the labelled durability information carefully and replace products that have deteriorated or been stored improperly. |
WHEN NOT TO USE A PRODUCT
Signs That a Cosmetic May No Longer Be Suitable for Use
The labelled period is important, but the product's actual condition also matters.
Stop using a cosmetic if you notice concerning changes such as:
- An unusual or unpleasant odour.
- Unexpected changes in colour.
- Significant changes in texture or consistency.
- Visible mould or suspected contamination.
- Unexpected separation that does not match the product's normal characteristics.
- Damaged or compromised packaging that may affect the product.
Not every formula change is visible, and a product that looks normal is not automatically safe beyond its labelled durability period. If you are uncertain, avoid using it and consult the manufacturer or an appropriate professional.
PRACTICAL ROUTINE
How to Keep Track of When You Opened a Product
Most people remember when they purchased a product more easily than when they opened it.
A simple tracking system can prevent confusion.
Record the date when you first opened the product.
Identify the manufacturer's indicated period after opening.
Follow the storage instructions on the packaging.
Check both the indicated period and the product's condition.
You can use a small label on the container, a note on your phone or a simple spreadsheet.
The goal is not to create a complicated inventory system. It is to avoid relying on memory alone.
Does an Unopened Cosmetic Last Forever?
No.
An unopened product may remain suitable for longer than an opened one, but that does not make its shelf life unlimited.
Formulations can change over time, even in unopened packaging.
Temperature, storage conditions, packaging integrity and the product's original stability all matter.
If you have an unusually old unopened cosmetic and cannot determine its suitability, seek clarification from the manufacturer rather than assuming it is safe simply because the seal is intact.
AUTHENTICITY & FRESHNESS
Can an Original Cosmetic Still Be Too Old to Use?
Yes.
Authenticity and suitability for use are different questions.
An original product can become unsuitable because of age, contamination, improper storage or damage.
Equally, the presence of a printed PAO symbol or batch code does not independently prove that a product is genuine.
When buying European beauty products internationally, it is useful to distinguish:
- Authenticity: Is this a genuine product?
- Durability: Is it still within the applicable period of use?
- Condition: Has it been handled and stored appropriately?
- Suitability: Does the product fit the intended non-medical personal-care use?
SMARTER BEAUTY SHOPPING
Buying More Products Is Not Always Better Value
A lower price per unit can look attractive, especially when buying several skincare or personal-care products together.
But if you purchase more than you can reasonably use before the applicable durability period, the apparent saving may disappear.
Before buying multiples, consider:
- How frequently you use the product.
- Whether you already have an opened product in the same category.
- Whether the product is for one person or several users.
- How you will store unopened units.
- Whether the purchase quantity is realistic for your routine.
For a more practical approach, read How to Choose Personal Care Products on a Budget Without Overbuying .
FREQUENTLY ASKED QUESTIONS
PAO & Cosmetic Expiry FAQ
What does 12M mean on a face cream?
When displayed with the open-jar PAO symbol, 12M indicates a 12-month period after opening under appropriate use and storage conditions.
Does 6M mean six months after purchase?
No. The PAO period relates to opening the product, not automatically to the purchase date.
Why does my cosmetic have no expiry date?
Under EU rules, a minimum-durability date is not mandatory for cosmetics with a minimum durability exceeding 30 months. PAO information is generally required where relevant.
Is a batch code the same as an expiry date?
No. Batch codes are primarily used for traceability. They do not follow one universal consumer-readable expiry-date format.
Can I use a cosmetic after its PAO period?
The manufacturer-indicated period should be respected. The fact that a product still looks or smells normal does not establish that it remains suitable beyond that period.
Can an unopened skincare product expire?
Yes. Unopened cosmetics do not have unlimited shelf lives. Product stability, storage conditions and applicable durability information remain important.
Should sunscreen be replaced if it has been exposed to high heat?
Follow the manufacturer's storage instructions. If a sunscreen has been exposed to unsuitable conditions or shows deterioration, do not assume it still provides its intended protection. Contact the manufacturer if uncertain.
Is the PAO symbol proof that a cosmetic is authentic?
No. The symbol communicates durability information but does not independently verify the authenticity of a physical product.
FINAL TAKEAWAY
Understanding PAO Helps You Use Beauty Products More Wisely
The open-jar symbol is small, but the information behind it is useful.
It helps you distinguish between an unopened product's minimum durability and the period for which an opened product is intended to remain suitable.
The essential distinctions are:
PAO ≠ Purchase Date
PAO ≠ Manufacturing Date
Batch Code ≠ Universal Expiry Date
Original Product ≠ Unlimited Shelf Life
Proper Storage Matters
Understanding these differences supports more informed product choices, better storage habits and less unnecessary overbuying.
About LuxBeautyPlus: LuxBeautyPlus is operated by LUXPLUS UG in Germany, within the LuxPlus Group . Our educational guides help international shoppers better understand European beauty and personal-care products, product information and purchasing considerations.
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