Hi Cutecurtz: I was always told Green was not a healthy color and you should call your Gastrointestinal doctor or your CF doctor. BM's are always an indicator of something going on in our ability to eliminate waste. Your should check it out. There was only one time I took Callcium with Magnesium and Boron. The boron in the Calcium will sometimes cause the stool to be green. good luck
JenWren
JenWren