I tested off the chart high for reactions to both casein and whey on the York delayed food allergy test. I assumed that they could be found separately in different foods. Otherwise why would they test for both? I have seen a bread recipe that calls for the addition of sweet dairy whey. I don't know if that would be whey in a pure form (if there is such a thing) or if casein would also be present. At any rate I am not adding it in my bread.
--Judy