Xtracal-D is a combination supplement manufactured by Pharmasia Limited, containing 500 mg of calcium carbonate and 200 IU of vitamin D3 (cholecalciferol). Calcium is essential for maintaining strong bones and teeth, while vitamin D3 enhances calcium absorption and supports bone health. This formulation is used to prevent and treat calcium and vitamin D deficiencies, particularly in conditions such as osteoporosis, osteomalacia, rickets, and hypoparathyroidism. It is also beneficial during pregnancy, lactation, and for individuals on medications that may deplete calcium levels.