Spring is the golden period of calcium supplementation. As the saying goes, a year's plan lies in spring. This is because in the snowy winter, people will "humble themselves" for several months. When they go out for outdoor exercise in spring, the blood flow of bone circulation will increase and bone metabolism will increase, so the absorption and utilization of calcium by bones will also increase. At this time, you should drink more milk, especially some functional milk to supplement calcium, which can get twice the result with half the effort.