Period after opening, batch code and shelf life explained

Customers mix these up, and so do staff. Each mark answers one question. The batch code says where the jar came from, the date says how long it keeps unopened, and the symbol says how long it lasts after opening.

A batch code is not a date, although some brands hide a production month inside it, and only the brand can tell you how its codes are built. Never guess from the digits.

The shelf date has its own trap. Some packs print a manufacture date instead of a best-before date, so read the words beside the numbers before you do any sums.

It is a small drawing of an open tub, followed by a number and the letter M, printed on the base, the tube crimp or the carton. The number is months. A tub marked 12M lasts twelve months from first opening. The clock starts when the customer breaks the seal. It does not start at checkout.

Products that keep for a long time may carry only the symbol. Products that spoil sooner show a date, often beside an hourglass drawing or the words best before end of, and many packs carry both marks. Under the EU Cosmetics Regulation, the label also shows the batch number, but other markets differ, so check the regulator for each country you ship to.

Take an unopened vitamin C serum with a shelf date a year away. The buyer opens it in March and the box carries a 6M symbol, so the serum should be used by September, whatever the printed date says. The earlier of the two always wins.

Storage matters too. A bathroom shelf beside a hot shower, a car glovebox in summer or a sunny windowsill can shorten a product’s life well before either printed date arrives. Ask where the jar has lived.

On the product page, show the open-jar months in the details tab beside the ingredient list, and write the symbol out in words for screen readers. State the minimum shelf life you ship with once, in your delivery policy, because a promise repeated on every product page goes stale the day the stock changes.

Keep the batch code off the page. It changes with every production run. Record it in the order instead. When the packer takes the jar, the batch lands on the order line, and support can open the order and see what was sent.

Returns need the same care. Read the code from the jar being returned, not from the order, and log it next to the reason, because the two can differ. Complaints then group by batch.

A customer writes, is this expired? A good reply asks for three photos: the batch code, the open-jar symbol and the date, taken in daylight so the print is legible. The agent then opens the order, compares the batch with what was shipped, asks when the product was first opened and works out the use-by date from that day.

Reactions are a different matter. If a customer reports redness or a rash, record the product, batch, date opened and what happened, then pass it to whoever handles product safety. Agents should not give medical advice.

Print the jar-reading card for every desk. This week, photograph the three marks on five of your own products and use the photos as the first page of the support guide.