Is the calcium we take in our daily lives enough? In fact, this question involves two aspects: first, do we eat enough calcium in our stomachs? Secondly, is the amount of calcium absorbed into the body sufficient? First of all, let’s answer the second question. For children and young people, our body maintains a balance between calcium intake and excretion under normal organismal mediation. In most cases, if there is no specific disease, most of the calcium ingested into the intestine is absorbed through the digestive system. Of course, if there is a related disease, such as suffering from chronic gastric disease resulting in poor absorption, there will be insufficient absorption of calcium, even after eating a large amount of high-calcium food, the body still does not have enough calcium. In this case, the calcium eaten in the stomach cannot be completely absorbed, and the amount absorbed into the body is certainly not enough and requires intervention therapy. So with this problem solved, let’s go back to the first question: “Do we have enough calcium in our stomachs?” As you can see from the graph above, our body’s calcium needs are at their highest during adolescence, roughly 1300mg/day, and even in adulthood, they remain basically at 1000mg/day. In our actual life, our intake of meat, eggs and milk does not meet our needs due to our dietary habits and our concerns about many highly nutritious foods. According to a survey of people in many big cities, the average calcium intake of adults in each city is about 500mg or less. Therefore, our usual calcium supplementation is not enough and is needed.