CoralCal-HD is a health supplement that combines coral calcium (a natural source of calcium carbonate) with vitamin D₃ to support strong bones and teeth. It is commonly used to prevent or treat conditions like osteoporosis, osteomalacia, rickets, and calcium deficiency during pregnancy, breastfeeding, or in people with chronic kidney disease. Vitamin D₃ enhances calcium absorption, making the supplement effective for maintaining bone density and overall bone health.