Vitamin SupplementSupports Bone Health, Immune Wellness, Cardiovascular Wellness and MorePromotes Calcium Absorption in The BodyScience-Backed Quality Since 1969 Vitamin D deficiency is common in the U.S. Adequate vitamin D intake is essential for optimal health, but getting enough vitamin D from your diet or through sun exposure is difficult for many people. Get the sunshine vitamin in a softgel with Swanson Vitamin D3—our most biologically active form of D3. Vitamin D benefits range from calcium absorption and bone-building benefits to supporting immune, cardiovascular and nervous system function. Vitamin D supplements may even promote a healthy mood, bringing more light to the sunshine vitamin. These easy-to-swallow softgels deliver 125 mcg (5,000 IU) of vitamin D3 (as cholecalciferol).