The intestines just cannot process it all at once.
In animals, as well as humans, the daily amount of Magnesium all at once causes diarrhea.
- 2600 mg – horse
- 1000 mg – beef cattle
- 3000 mg – dairy cattle
- 800 mg – monkey
Horses Merck Manual
Horse: 13 mg/kg body wt/day 200 lb horse/human = 2,600 mg/day
Mineral Supplements for Beef Cattle University of Missouri Extension
Cattle need about 0.04 to 0.1 % magnesium in the dry matter of their ration. (assuming lots in the feed)
Assuming a human eats 1 kg of food per day 0.1% would be 1000 mg of Magnesium element
0.2 – 0.25% of dry food – about 3X of Beef cattle
Nutrition in Primates Merick
0.08% of dry feed ==> 800 mg of Magnesium for a 200 lb human
0.04% dry feed ==> 400 mg of Magnesium for a 200 lb human