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Support for Bone Cellular and Immune FunctionDietary SupplementNon-GMOSupports Healthy Serum Calcium LevelsPromotes Calcium AbsorptionSupports Colon HealthVitamin D3 is a fat-soluble vitamin that helps maintain strong bones and teeth by supporting healthy serum calcium levels. It does this by promoting absorption of calcium in the digestive tract as well as reducing calcium loss through urine. Additionally Vitamin D supports colon health and may promote a healthy immune system. Vitamin D occurs naturally in very few foods and although it can be produced in the body obtaining adequate skin absorption from sun exposure can be difficult year round. Vital Nutrients offers supplemental Vitamin D in the active form D3 (also known as cholecalciferol).