Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Calcium is the most abundant mineral in the body, required to support vital processes such as nerve transmission, vascular contraction and vasodilation, as well as, muscle function, intracellular signaling and hormonal secretion. Though natural intake of calcium via a healthy and well-balanced diet is recommended, calcium supplements are used as well, in various situations related to health problems, medical treatments and/or sport nutrition. Recently, a new study linked calcium supplements to heart attacks?. To find out more about calcium, its impact on health and mechanism of action – read this book.