Checkcosmetic.net is an online database that allows users to input a brand and a batch code to determine exactly when a product was produced. This is critical because many cosmetics do not have a clear expiration date printed on them, as U.S. and EU regulations only require such dates for specific categories or products with short shelf lives.
Look for a small printed or stamped code on the bottom of the bottle or the crimped end of a tube. Note: This is not the barcode.