Jess, I have to have metamucil or something similar, or make sure I eat heaps of fibre (like sultana bran, porridge, apples, pears....) every day religiously when I'm on iron supplements. It is a common side effect to get constipated. I would try taking a good quality supplement if you're feeling so yuck. My Dr told me I need to start taking a supplement cause I'm still fully bfing DS. And I'm still on iron since I had low iron after haemmoraging (sp??) after giving birth.