Although studies have shown that magnesium can lower blood pressure, there are still some doubts. Researchers have not found any direct evidence that this mineral can reduce blood pressure. The results of 22 trials that followed a total of 2,028 participants are still pending.
In addition, these studies did not show any effects on mortality or cardiovascular events. Further research will be needed to clarify the exact role of magnesium in lowering blood pressure. For now, it is not known whether taking extra magnesium is beneficial for lowering blood pressure.
A review of 20 RCTs that tested the effects of magnesium supplementation on blood pressure concluded that consuming more magnesium than usual reduced blood pressure. The results showed that magnesium supplementation lowered diastolic blood pressure, but not systolic.
However, too much magnesium can be dangerous, causing irregular heartbeat, slow breathing, diarrhea, abdominal cramping, confusion, and even death.
A meta-analysis showed that a magnesium supplement may reduce blood pressure, but there was one problem with the studies. The small numbers of participants and high drop-out rates in many of these studies made it impossible to draw any conclusions from them.
Higher-quality studies were more accurate, and the greatest reductions in blood pressure were observed in higher-quality studies. These results suggest that taking magnesium supplements to lower blood pressure is not necessary.