The magnesium in mineral water is not presented as supplement forms like “magnesium glycinate” or “citrate.” It is typically present as dissolved mineral magnesium (magnesium ions) and is listed on the label as “Mg.” Therefore, the more meaningful question is “how much magnesium does it contain?” Absorption depends on intake amount and overall diet. Higher-magnesium mineral waters may increase bowel motility in some people. Individuals with chronic kidney disease should manage magnesium load carefully.