Basic features Supports overall health Helps you meet your nutritional needs and support your daily health and well-being Vitamin D plays a very important role in calcium absorption and metabolism The dose of this medication is moderate and can be used to prevent vitamin D deficiency. Activates calcium absorption from the gastrointestinal tract. Overview Vitamin D is an essential vitamin (a fat-soluble vitamin) that has many biological benefits, some of which include increasing intestinal absorption of calcium, magnesium, and phosphate. Vitamin D also prevents calcium loss from the kidneys