Hendricksons dressing and seasoning has a product life of 12 months, regardless of whether it is opened or unopened. The product expiration date is stamped clearly on the left panel on our bottle label and is 12 months to the day from when it was manufactured. This date can be safely extended several months by refrigerating our product immediately after purchase, even the unopened bottles. Note that opened bottles of Hendricksons must always be refrigerated.