We guarantee the quality of our products up to the code date, assuming they have been stored correctly. If the product has already been opened, refrigeration will often keep the product usable for a longer period of time. If the product has not been opened but has been stored in a cool, dark place, then it may still be usable. The best way to tell is to open it up and carefully evaluate its smell for any rancidity. If in doubt, dispose of the product.