This should start with the composition of bones. The human skeleton consists of bone cells, bone minerals and organic matter. Bone cells include osteoblasts, osteoblasts and osteoclasts; Organic matter mainly includes collagen, proteoglycan and bone growth factor, which determine the elastic characteristics of bones. Inorganic substances mainly include calcium, phosphorus, magnesium, potassium, sodium, zinc, manganese and copper. These mineral elements determine the hardness and rigidity of bones, and calcium is actually only the main component of inorganic substances in bones. Collagen is fibrous and has strong compressibility. There are "holes" and "holes" between each collagen fiber and each collagen molecule, which are the storage places of calcium and phosphorus crystals. When bone is lost, both organic matrix and calcium are lost. If only calcium is supplemented without organic matrix, there will be no place for calcium after the loss of organic matrix. Therefore, it is impossible to have a good effect by unilaterally emphasizing calcium supplementation; In addition, calcium and phosphorus must be supplemented at the same time according to the ratio of 2: 1, so that calcium can be fully absorbed by human body. Although the calcium content of oyster shell and ore powder is high, its absorption is poor, so it is difficult to form bone calcium to stay in the body. This is why many middle-aged and elderly people have not alleviated the symptoms of calcium deficiency after routine supplementation of a large amount of calcium. Therefore, besides calcium, comprehensive bone nutrition should also include collagen, bone growth factor and proteoglycan, phosphorus, magnesium, potassium, sodium, zinc, manganese and copper, which is called whole bone nutrition.