J.W.
I had a non-hormone IUD and my milk supply was not affected at all. I did develop bad acne and had painful periods. Therefore, I switched to the lowest dosed birth control pill and my milk supply went down fast. I kind of expected that and it was ok since my son was about 22 months by then. My skin issues have always been my problem so please don't worry about that when trying a copper IUD. I will definitely try it again some time soon.