1. Improve the body's absorption of calcium and phosphorus, so that the plasma calcium and plasma phosphorus levels reach saturation.
2. Promote growth and bone calcification, promote dental integrity.
3. Increase the absorption of phosphorus through the intestinal wall and increase the reabsorption of phosphorus through the renal tubules.
4. Maintain the normal level of citrate in the blood.
5. To prevent the loss of amino acids through the kidneys.