Homemade raw almond butter will keep in the refrigerator for about two weeks, and store-bought may keep for months. Once opened, almond butter and peanut butter, especially the kind without added salt, sugar, or preservatives, is incredibly susceptible to rancidity and spoilage. The healthy unsaturated oils oxidize quickly on exposure to heat, light, and air, creating rancidity that makes them smell and taste bad.

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