Amy2013 - Oops, that's not so good. Taking mag will give you diarrhea, but you shouldn't be taking it at a level that you are having problems. Usually doctors tell patients to find the dosage that gives you diarrhea, then back off. The body gets used to it over time, and you can often increase it again later, but you shouldn't have loose stools. Taking magnesium blood levels is really a good idea if you're using it too 😀