Lucy Pet Formulas for Life ™ have an expiration of 15 months from the date of manufacture. We use no artificial preservatives, only natural mixed tocopherols (Vitamin E). Since oxygen is the enemy of kibble, it is best to store it in an airtight container. If you cannot store our bag in an airtight container or bag, be sure to roll the bag closed and tight to minimize exposure to air. This will also keep your kibble fresh and free of pests. Never feed a food after its expiration date.