Magnesium citrate
"Iron pills make one constipated. Magnesium citrate 2x a month relieves problem. Recommend replenish water and a few vitamins after losing so much fluids. Advise to take on a day off to prevent embarrassing and uncontrollable potty trips. I take at night before bed, next morning its works. I stay at home for most of the day until mission accomplished. Good luck!"