Vitamin D3 is the body’s preferred form of Vitamin D for raising levels of circulating Vitamin D in the body. Research has found that Vitamin D receptors are located throughout the body, including in your muscles, skin, bone, and immune system. This Vitamin D3 supplement provides 1000 IU (25 mcg) to support bone, teeth, muscle, and immune health—in only 1 daily softgel. Helps support a healthy immune response, aids in Calcium absorption to support strong bones and teeth and supports muscle function.