Vitamin D3 50 mcg (2,000 IU). Everyone needs vitamin D. That’s why we offer the benefits of vitamin D3 in strengths from 1000 IU to 10,000 IU. Why choose Natural Factors vitamin D3 softgels? First, our softgels feature vitamin D3, which is better at raising your 25(OH)D levels than vitamin D2 and lasts longer in your body. Second, our vitamin D3 is delivered in a base of organic flaxseed oil. Because vitamin D is fat-soluble, it’s better absorbed in the presence of fat. Increases calcium absorption. Essential for bone health. Helps regulate the immune system. Maintains healthy nerves and muscles. Easy-to-swallow softgels.