The highest concentrations of magnesium in the body are in your heart and your brain, which is why a deficiency can be deadly, especially for cardiovascular disease risks.
New research from Mexico has found that magnesium is good for the heart not only for its effects on muscles but because it reduces coronary artery calcification, which is a marker of atherosclerosis and a predictor of cardiovascular death. In this March 2016 study, 1276 Mexicans had their serum magnesium (the amount measured within their blood) examined. They were aged 30-75 years and free of any symptoms of cardiovascular disease.
Adjusting for age, body mass index (especially abdominal fat), blood pressure, physical activity, insulin-glucose levels (diabetes indicators), alcohol consumption and smoking, LDL- HDL cholesterol, triglycerides, and family history, there was a similarity in those with clean, clear arteries. People with the highest magnesium had 48% lower odds of hypertension, 69% lower odds of myotonic dystrophy (muscle wasting/weakness disease that affects many muscles including the heart), and 42% lower odds of coronary artery calcification compared to those with the lowest serum magnesium.