Important for healthy bones, teeth and muscles, Kirkland Signature Vitamin D3 2000 IU also supports immune system health. Kirkland Signature Vitamin D3, the form of vitamin D that your body prefers is a great way to ensure you are getting enough of this essential micronutrient to support overall health.† • Helps support for bone, teeth, muscle and immune health.† • Helps improve intestinal calcium absorption in the body.† Vitamin D is a fat-soluble vitamin that is unique because it is the only nutrient that can be synthesized by the skin from ultraviolet rays. In the food supply, there is a paucity of foods that naturally contain vitamin D. Instead most dietary vitamin D is consumed through fortified foods, although still in relatively small amounts. Vitamin D supplements are a prudent option to fill nutrient gaps that often exist for this crucial micronutrient.† Vitamin D2, or ergocalciferol, is plant-derived, while vitamin D3, cholecalciferol, is animal-derived and is the body’s preferred form based on research that demonstrates its superior ability to raise and maintain vitamin D levels in the blood.1†