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Bone and Immune HealthVitamin SupplementSupports Bones Plus Immune and Emotional Wellness Promotes Calcium Absorption in the BodyMost Biologically Active Form of Vitamin DScience-Backed Quality Since 1969Vitamin 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.