Vitamin D3 is a fatsoluble vitamin, is used as a precursor for calcium, phosphorus metabolic hormones, it has close relationship with sunshine, so also called the "sunshine vitamin". Vitamin D3 is fat soluble, insoluble in water, can dissolve in fat or fat solvents, high temperature and oxidation in neutral and alkaline solution.
Vitamin D3 has the following physiological functions:
1. Improve the absorption of calcium and phosphorus in the body, and make the levels of plasma calcium and phosphorus reach saturation.
2. Promote growth and bone calcification, promote healthy teeth;
3. The absorption of phosphorus was increased through the intestinal wall, and the reabsorption of phosphorus was increased through the renal tubules;
4. Maintain the normal level of citrate in blood; 5. Prevent the loss of amino acids through the kidney.