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Bone and Immune Health2 000 IU (50 mcg) Per ServingVitamin SupplementSwanson Premium Vitamin D3 Liquid Drops are the easiest way to supplement your vitamin D intake next to sitting outside in the sun to get the "sunshine vitamin." You get 50 mcg (2 000 IU) in each serving. It couldn't be any simpler. At 400 IU per drop it also makes for easy personalization depending on your specific needs as determined by you and your doctor.