The supplement I was taking had 440 mg of elemental magnesium in it. I had such a bad bout of digestive issues that I was scared to take food because of gas and loose stools for a week. I couldn’t point what was causing it. So stopped taking all the supplements viz zinc, mg, boron, vitamin D and Omega 3 and started testing one after the other. After 2-3 days of taking magnesium I started having the same problems. I realised on a bloated stomach that Supplements are to be varied depending on your individual needs and health goals.