what nutrients are in kefir?
['Protein: 4 grams.', 'Calcium: 10% of the RDI.', 'Phosphorus: 15% of the RDI.', 'Vitamin B12: 12% of the RDI.', 'Riboflavin (B2): 10% of the RDI.', 'Magnesium: 3% of the RDI.', 'A decent amount of vitamin D.']