Magnesium levels are controlled in the body in large part by the kidneys, which filter and excrete excess magnesium and other minerals. (ancient-minerals.com)
Therefore, inadequate magnesium intake seems to prompt a vicious cycle of low magnesium levels, elevated insulin and glucose levels, and excess magnesium excretion. (healthy-holistic-living.com)
Regarding magnesium, it is my observation that excess magnesium that is quickly absorved also is not good at all, first of all it activates too much of the vitamin d — which seems to cause bone loss, second it temporarily stops bone remodelling process — information found from research on patients with kidney dialisis, and as far as i can tell my kidneys are normal, especially now that i am not vitamin d intoxicated. (westonaprice.org)