The role of calcium is as follows: First, it constitutes the bones and teeth of the body, so to make the tendons and bones strong, it is necessary to consume sufficient calcium, otherwise the risk of rickets, osteoporosis and dental caries may occur will be higher, so the first role of calcium is to constitute the bones and teeth of the body. Secondly, it can maintain normal nerve excitability, which in turn can avoid the high incidence of cramps. Thirdly, it can well maintain the completion of muscle contraction action, so when calcium deficiency also tends to appear muscle pain and muscle weakness. In order to have a good muscle contraction function, it is necessary to have the important regulatory role of calcium.