I am posting this message again since I feel that it escaped attention when I posted it about two days ago when the BB was experiencing some trouble.The 'Calcium Effect' discovered by Linda seems to have helped a number of persons with IBS-D. I did not find much benefit from Caltrate Plus tablets that were recommended by Linda. However, I do find a lot of help from Calcium Citrate tablets. The brand ("Nature Made") that I am taking has 325 mg of calcium as citrate and 200 IU of vitamin D per tablet. I take three of these tablets per day and the improvement in my IBS-D symptoms has been remarkable. Others who were not helped by Caltrate Plus may like to try these tablets. Best wishes to all.