A number of persons with IBS-D seem to have benefited from the "Calcium Effect" discovered by Linda and generously revealed by her on this BB. I was one of those persons who was not helped by Caltrate Plus that was recommended by Linda. However, I have been able to benefit from the Calcium Effect by taking Calcium Citrate Pills with vitamin D. The brand of pills ("Nature Made") that I am taking has 325 mg calcium as citrate and 200 IU vitamin D in each pill. I take three pills a day about an hour after or an hour before taking any food. Others who were not helped by Caltrate Plus may like to try this. Best wishes to all comrades in distress.