"Magnesium
is one of the body's major electrolytes,
along with potassium, calcium and sodium.
When dissolved, these minerals form the
salty, electricity-conducting soup that
bathes and permeates the cells of our body -
in blood serum, spinal fluid and
intracellular liquid. Magnesium is known to
be involved in many functions, including
enzyme and hormonal actions...(it) seems to
regulate the balance of calcium and sodium
in our cells, particularly in our heart and
blood vessels...adequate intake of magnesium
helps our hearts to beat smoothly and
regularly and withstand the stress and abuse
of daily life. It also means magnesium helps
our blood vessels remain open and relaxed,
lowering our blood pressure." (from The
Complete Book of Vitamins and Minerals for
Health)