To make a long story short, I have discovered that the supplement Magnesium gives me severe diarrhea. I was getting Calcium Citrate with Vitamin D3 and Magnesium and going into diarrhea and couldn't figure out what the problem was. I do have irritable bowel syndrome-diarrhea but it is activated by stress (and migraines as I have discovered), but nothing to this extent. After a long trial and error, I discovered it was the Magnesium. Dr. Oz touts the goodness of Magnesium and of course I made sure to add it to the supplements I use. When I saw my doctor the other day for my yearly physical, I explained it all to him. He said I was the second person that day that had been on the adverse end of advice from Dr. Oz. The other person took supplements with prescription meds without checking first with their primary care doctor--it was a potentially deadly combination and lucky she came in as the problems were developing. For me, he explained that Magnesium does not always need to be supplemented and is not always kind to people and can cause diarrhea. He said the "Milk of Magnesia" and Ex-Lax, people used for laxatives were made from a form of Magnesium. So it's good to remember, it may cause diarrhea and is something to discuss with your doctor before taking it. Diarrhea washes out the prescriptions and supplements you may be taking, so it was an unwise choice for someone like me. We learn as we go along.