Keep covered at 4°C (40°F) or below and eat within 1 day of mixing. Follow the earlier limit if the soy kefir’s use-by date or storage instructions after opening allow less time. Discard if left out of the refrigerator for more than 2 hours in total, or 1 hour above 32°C (90°F). Soy kefir may contain traces of milk from its starter culture. If you have a milk allergy, avoid products labelled as containing or possibly containing milk.