“All muscle cells, including those of the heart and of the smooth muscles lining the blood vessels, contain more magnesium than calcium. If magnesium is deficient, calcium floods into the smooth muscle cells of blood vessels and causes spasms, leading to constricted blood vessels and therefore higher blood pressure, arterial spasm, angina, and heart attack.12 A proper balance of magnesium in relation to calcium can prevent these symptoms. Dean Md Nd, Carolyn. The Magnesium Miracle (Second Edition) (p. 55).” CureMagnesium Author:Carolyn Dean, MD, Nd