I really don't get the complaint about the iron deficiency at all. Am I seriously missing something here? Does that go hand in hand with kidney issues? I have no idea. I just know that I have a tendency to go anemic from low iron and whenever I do I just buy those slow release iron tablets and take them for a week or so. Apparently I've had this tendency since infancy and it only seems to happen now after I've been really sick. About a week of taking iron supplements and I'm fine again. Does that not work if you have kidney issues as well?