You need to take Magnesium Citrate to bowel tolerence and Natural Calm Or Mama Calm is good for this. You cannot overdose on Magnesium ever. If you take too much, it will just give you diarrhea. Natural Calm has helped at least one mom I read on a testemonial avoid Preterm labor. It is directly absorbed into your body almost immedietly. I highly recommend it. I use the Natural Calm, now. I have used the Mama Calm in pregnancy.