Batch code guide
Guerlain batch code checker
Use Cosmetic LOT to check a Guerlain LOT or BATCH code and estimate the manufacturing date when a supported decoder rule is available.
Ready sample
Try Guerlain with a sample LOT
Where to find the code
Check the product base, cap area, tube crimp, box flap, label edge, or barcode area. A Guerlain code may be printed in ink, stamped, embossed, or laser marked with low contrast.
What the result means
Cosmetic LOT maps Guerlain to decoder group 3, reads the LOT pattern, and returns a manufacturing date when the code matches a known rule. Estimated expiry uses the service's inspection window and should be checked alongside the product label.
Important limitation
A decoded date is not proof of authenticity, product safety, or warranty status. If the printed label, smell, texture, seal, or storage history looks unusual, treat the result as supporting information only.