Quest Vitamin D provides 1000iu of Vitamin D3. Vitamin D is a fat soluble vitamin produced in the body as a result of exposure of our skin to ultraviolet rays from the sun. Vitamin D is essential for the maintenance of healthy bones & teeth. A supplement is often considered by individuals with limited exposure to the sun. Why use Quest Vitamin D?• High strength formula • Supports healthy bones & teeth • Supports healthy immune function • Essential fat soluble vitamin • Safeguards intake of this essential nutrient, usually produced in the body as a result of exposure to sunlight Benefits of Quest Vitamin D • High potency • Suitable for vegetarians