✔ HIGH QUALITY INGREDIENTS - Vitamin D is a very important nutrient. Bulking Agents (Microcrystalline Cellulose, Calcium Phosphates), Cholecalciferol (Vitamin D3). ✔ WHY NUTRAVITA VITAMIN D3 4000IU TABLETS – Our product provides a maximum strength of 4000iu Vitamin D3, per one convenient easy-to-swallow tablet.