VITAMIN D3 1000IU. High Strength – 25mcg (1000IU) Per Tablet. 25mcg (1000IU). Vitamin D3 plays a vital role in our overall wellness by helping to support bone, teeth, muscle and immune health. This is where Red Label Health Vitamin D3 tablets can contribute by providing Vitamin D3 in an easy and convenient way to increase your daily intake of this vital nutrient.