All insulins have and need preservatives so that the insulin--whether in vials, pens, or cartridges--has some "shelf life" after the container is opened/started. Preservatives keep bacteria from growing in the containers of insulin once they've had their first use. Though most of the food we eat has some kind or preservatives in it to keep it fresher longer, no one expects that a loaf of bread, will keep indefinitely in the refrigerator without becoming moldy.
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