Low magnesium levels may increase the risk of arrhythmia (irregular heartbeat). A trial, conducted by two American universities, therefore aimed to assess the effect of oral magnesium (400 mg magnesium oxide daily) on atrial fibrillation, an irregular and often very rapid heart rhythm. A total of 59 participants received either 400 mg/day magnesium orally or a matching placebo. Magnesium levels significantly increased in the supplementation group. In summary, this trial supports the safety and tolerability of magnesium supplementation in preventing arrhythmia in these patients. More details can be found in the study.
Lutsey et al.