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Vitamin D, including forms such as ergocalciferol-D2, cholecalciferol-D3, and alfacalcidol, is a crucial fat-soluble vitamin that facilitates the absorption of calcium and phosphorus in the body. Adequate levels of vitamin D, along with calcium and phosphorus, are essential for building and maintaining strong bones. This vitamin is primarily used to treat and prevent bone-related conditions like rickets and osteomalacia. The body produces vitamin D when the skin is exposed to sunlight; however, factors such as sunscreen use, wearing protective clothing, limited sun exposure, darker skin, and aging can hinder sufficient vitamin D synthesis. Vitamin D, often combined with calcium, is also employed in treating or preventing osteoporosis, a condition characterized by bone loss. Additionally, it is used alongside other medications to address low calcium or phosphate levels due to disorders such as hypoparathyroidism, pseudohypoparathyroidism, and familial hypophosphatemia. In cases of kidney disease, it helps maintain normal calcium levels and supports regular bone growth. Since breast milk typically contains low levels of vitamin D, supplements or drops are provided to breastfed infants to ensure they receive an adequate amount.