Natural Factors Whole Earth & Sea Vegan Bioenhanced Vitamin D3 - Vitamin D, know as ‘the sunshine vitamin’ is vital for bone development and optimal immune support. It facilitates efficient calcium utilization, which facilitates strong bones and teeth. Since the primary dietary source of Vitamin D is fish and fortified dairy products, vegans and vegetarians are often lacking an adequate supply of this important nutrient. With 1000 IUs in each capsule, vegan, bioenhanced Vitamin D helps meet your dietary needs. Extracted from wild-harvested lichen, this product is ideal for those who are adverse to meat or dairy sources.