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Supplies vitamin D3 (400 IU per drop) in an emulsified form to aid in uptake and assimilation, especially important for those with malabsorption issues. Note: Inadequate levels of vitamin D are common. While the importance of vitamin D for musculoskeletal health is well documented, its importance in numerous other aspects of health are now recognized. They include (but are not limited to) cardiovascular health and immune function.