How long will margarine be “good” once it’s opened?

Once opened, margarine usually lasts about a month in the refrigerator. Keep a margarine stick in a covered butter dish to decrease drying out and prevent exposure to odors from other foods.
When buying margarine in a tub, select a tub size that you’ll finish in a month. Try to use a half-inch a week so that you’re always using a relatively fresh surface unhardened by oxygen.
Assistant Professor Franco Milani, Department of Food Science, University of Wisconsin


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