Bio-D-Mulsion® provides vitamin D3 (400 IU per drop) in an emulsified form to facilitate absorption and assimilation, which is particularly important for those with malabsorption issues. While the importance of vitamin D for musculoskeletal health is well documented, its importance in many other aspects of health is now recognized. These include (but are not limited to) cardiovascular health and immune function. It should also be noted that insufficient vitamin D levels are extremely common.