Vitamin D3, also known as cholecalciferol, which is a fat-soluble vitamin. It is a white crystalline powder, perishable in air or sunlight. Soluble in ethanol, ether, chloroform, or acetone, slightly soluble in vegetable oils, insoluble in water. Insen Vitamin D3 is used as a precursor for calcium, phosphorus metabolic hormones, it has close relationship with sunshine, so also called the "sunshine vitamin".