Each capsule provides 5000 IU of vitamin D as cholecalciferol (D3). The vitamin D3 form is more bioactive than D2 which is often the form used in many high-potency products. Vitamin D deficiency is one of the most common causes of metabolic bone disease and can also impact your immune system. This high-potency product can be used to support healthy vitamin D levels. The water-miscible powder used in this supplement is a good choice for patients with fat malabsorption issues. As an added benefit, this water-miscible "dry" vitamin D comes in a small, easy to swallow capsule.