Nature's Bounty, Vitamin D3, 1000 IU, 24 X 120 SoftgelsProduct Description Vitamin D3 is an essential nutrient that works with calcium to help develop strong bones and teeth.* Vitamin D3 also supports normal antibody production by the immune system and supports breast health.* An analysis of 5 studies concluded that increasing vitamin D intake up to 2000 IU per day could promote colon health.* Recent evidence also indicates that increasing vitamin D intake can support the health of the pancreas.*