The recommended daily dose for vitamin D3, or cholecalciferol, is 400 to 1,000 international units once daily for vitamin D insufficiency and 1,000 international units once daily for vitamin D deficiency. For prevention of falls, experts recommend 800 international units orally once daily along with calcium, explains Drugs.com.
Additional recommended daily dosages of cholecalciferol include 200 international units orally once a day for neonates, infants and children, notes Drugs.com. This vitamin functions to absorb calcium from the stomach and helps the functioning of calcium in the body. It treats or prevents various conditions related to the skin and bones, such as vitamin inefficiencies or deficiencies.