To ensure that black cumin can be kept for several months, it is advisable, as with most spices, to store the seeds in a cool, dark and dry place.
You have to be a little more careful with black cumin oil, because it is much more sensitive, especially if it is cold-pressed. Once opened, it should be used within 2 to 3 months. In addition, it must be stored in the refrigerator or in a fairly cool place, preferably airtight.
Since the shelf life is relatively short, it makes sense to only buy small bottles of black cumin oil.