You open a cream, then a serum a few weeks later: how do you know how long to use them? An open jar accompanied by “6M” or “12M” provides a useful reference. Here is how to read this indication and easily track your skincare routine without confusing the purchase date with the opening date.
What does the open jar symbol mean?
PAO stands for period after opening. According to the DGCCRF, the open jar symbol, accompanied by a duration, indicates how long the product can be used safely after opening. “6M” corresponds to six months; “12M,” to twelve months. This indication applies to the product it is on: do not apply the duration of your cream to your serum.
The reference period begins upon opening, not when the order is placed. To help you remember, write this date on the container or in your phone, a method also recommended by the FDA.
PAO and shelf life: two different pieces of information
The minimum shelf life is a date to look for near an hourglass or a statement inviting you to use the product preferably before a certain date. The PAO indicates a duration after opening. The DGCCRF distinguishes these two pieces of information and explains that the open jar symbol is intended for cosmetics with a shelf life exceeding thirty months.
In your bathroom, the main goal is to read all the information provided. Do not replace a printed date with your own calculation, and also follow the storage conditions specified on the packaging.
Two examples from the SMZ Dr Sophie range
The current product pages in the shop show different durations for two hyaluronic acid treatments:
- The hyaluronic acid face cream, 50 ml indicates six months after opening, according to the 6M symbol on the provided label.
- The hyaluronic acid face serum, 30 ml indicates twelve months, according to the 12M symbol on the provided label.
These examples do not establish a rule for all creams or serums. Also check the packaging of your own product. The indicated duration does not exempt you from following its directions for use.
Easy tracking in four steps
- Identify the duration. Check the container and box before storing your purchase.
- Record the opening date. Add a small dated label without covering the manufacturer's information.
- Set a reminder. Record the duration in months in your calendar, along with the exact name of the treatment.
- Keep a reference. Photograph the label and batch number so you can find them if you have a question.
For example, for a treatment with a 6M duration opened on January 5, a reminder on July 5 allows you to track the announced six months. This is an example of organization to be used alongside the other product indications.
Storage conditions also matter
The FDA reminds us that heat, humidity, and temperature fluctuations can affect cosmetics. Fingers and applicators can also introduce microorganisms. A displayed duration therefore does not replace good usage habits.
- Wash your hands before using your treatments.
- Keep containers clean and properly closed.
- Protect them from extreme temperatures; avoid placing them in a hot car, in particular.
- Follow the manufacturer's specific storage and application instructions.
What to do if in doubt?
A change in color or odor is a reason to discard the cosmetic product, according to FDA recommendations. Do not wait until the end of the reminder period to address an abnormality. If a reaction occurs after use, stop using the product and seek advice from a healthcare professional.
If you can no longer find the opening date or an indication on the label, contact us with the product reference and its batch number. For your next purchase, take the time to consult the product page, then keep useful references from the first opening.
Sources
- DGCCRF, Cosmetic product labeling: how to decipher it?, December 4, 2025.
- FDA, Using Cosmetics Safely — hygiene and post-opening tracking tips.
- FDA, Shelf Life and Expiration Dating of Cosmetics — storage factors.
- SMZ Dr Sophie product pages: 50 ml face cream and 30 ml face serum, label information reproduced on the shop.
Sources consulted on October 23, 2026. Product photographs: SMZ Dr Sophie.