Vitamin D3 1000 IU/25 mcg Tablets, 300 ct, QC98642 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Vitamin D3 is essential for absorption of calcium and necessary support for healthy bones, teeth and immune system. Vitamin D3 supports breast and colon health. No added yeast, wheat, sugar, lactose, preservatives, no artificial color or flavor, and gluten-free.