What PAO means
PAO stands for period after opening. On cosmetic labels, the open jar symbol followed by a number and M means months after opening. A 12M mark means the product should be used within 12 months after it is opened, assuming normal use, suitable storage and no obvious contamination.
PAO is not a decoration and should not be guessed from what similar brands print. It should be supported by the product's formulation, preservative system, packaging, use pattern, stability information and safety assessment. A lip balm in a twist tube and a water-based face cream in a jar have very different exposure risks.
- 6M means six months after opening.
- 12M means twelve months after opening.
- PAO starts when the consumer opens the product.
PAO versus expiry date
PAO is different from a date of minimum durability. An expiry or best-before style date tells the customer the date until which the product remains suitable under appropriate storage before opening or in general use. PAO tells the customer the safe use period after opening.
Under EU cosmetic rules, if the minimum durability is 30 months or less, the product needs a date of minimum durability. If the minimum durability is more than 30 months, the product generally needs PAO unless the concept of durability after opening is not relevant. Some products may carry both where it helps the customer.
When PAO may not be relevant
PAO is not always meaningful. Single-use sachets, products that do not open, and products where deterioration after opening is not relevant may not need it. Aerosol-style packs and certain very stable products can be different from open jars that customers dip fingers into repeatedly.
Do not remove PAO simply because the pack is small. If PAO is relevant but space is limited, solve the packaging problem with outer packaging, a tag, leaflet or better container choice. The small product still needs a compliant label route.
How makers choose a PAO period
The PAO period should come from evidence. For indie makers, that evidence often includes the cosmetic safety report, preservative efficacy testing where needed, stability observations, packaging compatibility and supplier data. A safety assessor may recommend a PAO based on the product type and supporting documents.
Water-based products usually need more caution because they can support microbial growth if preservation fails or contamination is introduced. Anhydrous balms can still oxidise, go rancid, melt, grain or become contaminated through use, so they are not automatically unlimited.
- Review formula water activity and preservation.
- Consider jar, tube, pump or dropper exposure.
- Check storage conditions and customer use.
How PAO appears on the label
The usual format is the open jar symbol followed by the period, such as 6M, 12M or 24M. The symbol should be clear enough to read at the printed size. If you use words instead of or in addition to the symbol, keep the wording plain and consistent with the market language requirements.
Place PAO near other durability, batch or product information where it can be found. Avoid hiding it under a flap the customer will throw away if the container itself needs the information. For tiny cosmetics, check whether outer packaging, a leaflet or an attached label is needed.
Recordkeeping matters
Your product information file should make it clear why the PAO was chosen. Keep the formula version, preservative information, test reports, packaging details and assessor recommendation together. If you later change a preservative, jar, pump, fragrance or process, review the PAO.
Customer complaints can also be useful signals. If customers report separation, smell changes, mould, leaking or irritation before the PAO period ends, investigate the batch and the assumption behind the PAO. A label is only useful if it matches real product performance.
Frequently asked questions
What does 12M mean on a cosmetic?
It means the product should be used within 12 months after opening, assuming normal use and storage.
Is PAO the same as an expiry date?
No. PAO is the period after opening. A date of minimum durability or expiry date is tied to a specific date.
Do anhydrous balms need PAO?
They may. Anhydrous products can still oxidise, become contaminated or degrade after opening, so follow the safety assessment and evidence for the product.
Can I choose 24M because it looks better?
No. The PAO should be supported by formula, packaging, testing, supplier data and safety assessment.
Where should PAO go on a small label?
Put it where the customer can read it, or use compliant outer packaging, a leaflet, tag or attached label if the small container cannot hold all required information.