Several factors can negatively influence circulating Calcium levels: unbalanced diets, age, lactation, menopause, use of glucocorticoids as well as of laxative. A small portion of Calcium is also naturally excreted in the urine. To compensate for decreasing blood Calcium levels, bone is degraded to release Calcium. This is why a constant supply of Calcium through the diet is primordial.
Not only the total amount of ingested Calcium is important to keep strong bones, muscles and nerves: from the food to the bones, Calcium follows a complex path. Without the help of two vitamins this would not even be possible.