Calcium is the most abundant mineral in the body, and is essential for strong bones and teeth and for the maintenance of healthy gums. It is also important for muscle contraction, nerve activity, beating of the heart, hormone release, blood clotting, energy production and proper immune system function. Requirements are greatest during periods of growth, such as childhood, during pregnancy and when breast-feeding. Adult requirements are around 800mg/day. Waters rich in Calcium(mg/L) include: Gerolsteiner(348), Badoit (190), San Pellegrino(187), Perrier(128) and Uludag (112).