Food supplement based on calcium, magnesium, vitamin D and fossil coral. Calcium is necessary for the maintenance of bones in normal conditions, magnesium contributes to the maintenance of bones in normal conditions and vitamin D contributes to the normal absorption and utilization of calcium and phosphorus and to the maintenance of normal calcium levels in blood. INSTRUCTIONS FOR USE It is advisable to take 4 capsules a day, 2 in the morning and 2 at night, with plenty of water.