People who do not get adequate sun exposure or Vitamin D fortified foods are at the risk of developing Vitamin D deficiency. Indeed, it is now thought that the majority of those who live in cool climates - whether omnivore, vegetarian or vegan - are vitamin D deficient to some degree.
Vitamin D deficiency classically causes rickets and osteomalacia (thin bones). Prolonged breastfeeding is a cause of rickets in some children who don't get enough vitamin D in their breast milk and excessive use of sunscreens can also lead to vitamin D deficiency.
This high potency formulation contains 2400iu in each tablet.