This can result in pale or yellowish skin, as well as weakness and shortness of breath. A study published in the American Journal of Hematology found that vitamin B12 deficiency was a common cause of ...
But, “Taking high doses of magnesium (more than 400mg) for a short time can cause diarrhoea,” they add ... Signs of very low magnesium levels include nausea, constipation, nighttime leg cramps, ...