For bones, the immune system, and muscles. During times with less sunlight or when spending a lot of time indoors, sunlight is often insufficient to meet the body's vitamin D needs through natural production. Tetesept Vitamin D3 2000 high-dose contains 2000 I.U. (50 μg) of high-dose vitamin D3. Vitamin D contributes to the maintenance of normal bones and teeth, supports normal immune system function, and helps maintain normal muscle function. Take once daily. Easy-to-swallow mini tablet. Gluten-free and lactose-free.