Vitamin D-3 is an especially useful supplement for those who do not get a lot of sun exposure. Vitamin D-3 is a fat-soluble vitamin that is necessary for maintaining strong, healthy teeth and bones. Many vitamin D supplements use ergocalciferol or vitamin D-2, but Vitabase Vitamin D uses cholecalciferol (D-3), a more bioactive form. This is the same form of vitamin D made by the skin
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