Hello and I'm sorry to hear about your experience with Magnesium. Can I ask what kind of Magnesium supplement you're taking? Some have more side effects than others in terms of GI issues. I was also told to take Magnesium in the OXIDE form for constipation. I have experimented this past year and have taken 400-2000 depending on my symptoms. I was diagnosed with Gastroparesis and related disorders since the onset. The magnesium never bothered me but wasn't predictable if it was going to help. I can't say it did much in terms of regular relief. I never had side effects and I have done a lot of research on Magnesium and it's different forms and from what I gather, it seems to be really safe and is actually recommended for anyone to take with little risk as far as I know. The only thing I found that I need to be careful of is how it can REDUCE the absorption of other medications or supplements you are taking. You want to take the Magnesium either 2 hours before or 2 hours after taking your other pills. I found this out doing my own research, I wasn't told by even my doctor and I"m on a lot of other meds and supplements so it's a good thing to know.