Calcium is not only important for bones and teeth—it also plays a role in muscles, nerves, the heart, and blood clotting. In order to function properly, it needs the support of other nutrients: vitamin D3 ensures absorption, vitamin K2 directs calcium to bones and teeth, and magnesium regulates its use.

It is found in dairy products, poppy seeds, almonds, tofu, sardines, and cabbage, but its intake can be reduced by diet or higher bodily demands. Therefore, it is important to monitor its sufficiency – and supplement it if necessary.