Vital Nutrients' Vitamin D3 2000iu 90 Veg Capsules contain cholecalciferol, a form of Vitamin D which has been proven to support strong bones and teeth by aiding healthy serum calcium levels.* It helps with this by increasing absorption of calcium in the digestive tract, as well as reducing calcium excretion through urine.* Vitamin D supplementation may also promote a healthy immune system and colon health.* Already scarce in food, Vitamin D can be difficult to get enough of through natural skin absorption, especially year round.