What does the 12M symbol mean?
Plain explanation of the period-after-opening (PAO) jar symbol on beauty packaging — including marks like 6M and 12M.
2026-08-12
Quick answer
The open jar symbol with a number like 12M usually means the manufacturer’s suggested period after opening — for example, twelve months. It is a packaging guide, not a shopping recommendation.
How to use it at home
- Find the open-jar icon on the package or leaflet.
- Note the number (6M, 12M, and similar).
- Write down the day you first opened the product.
- Add that open date to your beauty inventory so the reminder is not only in your head.
Related marks
Some products also show a printed expiry date. When both exist, record both if you can — open date for PAO tracking, and printed expiry when present.
Important notes
- Symbols vary by brand and region.
- If the mark is missing or unreadable, track your own open date anyway.
- This explanation is for organizing products you own — not medical or safety certification advice.
Related guides
- How long does makeup last?
- How long does skincare last after opening?
- How to track cosmetic expiration dates
Yueji is built around remembering what you own and when it should leave your shelf.