A batch code, also called a lot code, identifies the production run your product came from. It isn’t an expiration date. It matters when something seems wrong, because it lets the brand trace your bottle to a specific run when you report a packaging problem, an unusual change or a reaction.
What a batch code is
Manufacturers make products in batches. Each batch gets a code, often a mix of letters and numbers, that links it to production records: when it was made and which materials went into it. Codes are usually printed or stamped on the container, the crimp of a tube, or the outer box.
Where to find it
- On the bottom or back of bottles and jars.
- On the flat crimped end of tubes.
- On the outer carton, sometimes as well as on the container.
- Sometimes near a small printed code area or barcode.
Codes can be tiny or faint. Photograph the code, the ingredient list and any date symbols when you open a product, especially if you recycle the box.
Batch code vs expiration date
They answer different questions. A batch code says which run. An expiration date or a period-after-opening symbol (an open-jar icon with a number, such as 12M) says how long. Some brands encode a manufacturing date inside the batch code, but formats differ between companies. Don’t try to turn an unfamiliar code into a shelf-life calculation. Ask the brand. Does skincare expire?
When the batch code matters
- A reaction. If a product irritates your skin, the batch code helps the brand check whether other reports relate to the same run.
- A change you notice. Unusual smell, color, separation or texture compared with a previous bottle.
- A packaging fault. A leaking pump, broken seal or damaged container.
- A recall. Recalls are usually announced by batch or lot.
How to report a problem well
- Stop using the product.
- Keep the container and what’s left in it.
- Note the product name, where and when you bought it, and the batch code.
- Describe what you noticed, and when, in plain words. Photos help.
- For a reaction, include when it started and what you did. Seek medical care for anything severe.
Under US cosmetics law (MoCRA), companies responsible for cosmetics must keep records of adverse event reports and report serious ones to the FDA. A batch code makes that record more useful. When stinging is a warning sign.
For Ozera
Contact us using the details on the label or at hello@ozeralabs.com. For a reaction, visit Product Safety. We refund reactions without asking for the bottle back, and the batch code helps us keep an accurate record.
Further reading: FDA: Shelf life and expiration dating of cosmetics · FDA: Cosmetics labeling guide
Every Ozera formula publishes its full ingredient list on the product page. Read the ingredients.
Photography: Annie Spratt / Unsplash. Editorial photograph.