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Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.
Skeleton. Vitamin D3 has been known to improve the strength of bones. It helps many people avoid osteoporosis, or weak bones, and is recommended in significant quantities if bones are fragile. This is most common among women, especially post-menopausal women, and longtime corticosteroid users.