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Created in 2008, Phoenix Rising is the largest and oldest forum dedicated to furthering the understanding of, and finding treatments for, complex chronic illnesses such as chronic fatigue syndrome (ME/CFS), fibromyalgia, long COVID, postural orthostatic tachycardia syndrome (POTS), mast cell activation syndrome (MCAS), and allied diseases.
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I use magnesium citrate and it works well. For magnesium it is very important to split up the doses to 100 mg at a time and take them throughout the day. If you take too much at once then the small intestine can't absorb it fast enough and magnesium then causes diarrhea in the large intestine. 400 mg is a good maintenence dose of magnesium, but higher doses are possible if you are deficient. Also high b6, and vitamin d levels are absolutely essential for magnesium absorption.
I also used the liquid elemental magnesium, I found that it absorbed much quicker. It is a bit more expensive though.