Hello, I am suffering some major prolonged constipation. I usually take 400-600mg of magnesium glycinate chelate. I tried increasing it up to 1200mg and it wasn't helping. I tried Reacted magnesium. I tried high doses of magnesium citrate and vitamin C. So, now I have magnesium oxide powder, but NIH has freaked me out by saying it should only be used short-term and not repeatedly and "Do not take a dose late in the day on an empty stomach, " which is exactly how I want to take it -- before bed. It also says it is used as an antacid and I'm in need of MORE stomach acid and not LESS. I need to take 1200mg+ to move things along, but now I'm scared to. Does anyone have more info on magnesium oxide? Thank you!