Alkaline phosphatase in children is an important indicator of a child’s bone metabolism, indirectly reflecting parathyroid function, liver and gallbladder disease, calcium and phosphorus metabolism in the body, and bone growth. Normal values range from less than 500 U/L for children less than 12 years of age to 40-150 U/L for children 12-15 years of age. It should be noted that the normal values vary from hospital to hospital due to differences in test reagents and test methods. Therefore, an alkaline phosphatase of 245 U/L in children needs to be considered for calcium supplementation or by what route, depending on age and other test results. For children, high alkaline acid phosphatase is mostly a sign of calcium deficiency in the body during growth and development, so it is important to choose effective and reliable calcium supplements available in the market. In addition to eat more calcium content of food, including dairy products, soy products and many seafood are rich in calcium, such as fish, shrimp, kelp, sea cucumbers, etc.; vegetables are green beans, fungus, kale, okra, etc.. Calcium supplementation with food is not only nutritionally balanced, but also can change the bad habit of picky eating from childhood. Generally speaking, children under 2 years old need to take 400-600mg of calcium supplements per day; children between 3 and 12 years old need to take 800-1000mg of calcium supplements per day. If your child usually eats a balanced diet and is not picky about what he or she eats, he or she is usually not deficient in calcium. If your child has symptoms of calcium deficiency, you can first choose calcium carbonate granule preparation for calcium supplementation treatment, and at the same time, pay attention to avoid taking it orally at the same time with zinc, to avoid affecting each other’s absorption. It is better to take vitamin D at the same time, because vitamin D can promote the absorption of calcium.