Bone composition is about 70% minerals, 22% organic substances, the remaining 8% is water. 1. Minerals: mainly calcium, phosphorus, sodium, magnesium, iron, fluorine and other ions, of which calcium ions are the most abundant, followed by phosphorus. Calcium in the body often exists in the form of calcium phosphate, which is the main component of bone. 2. Organic substances: such as proteins, collagen fibers, enzymes, bone matrix, chondroitin sulfate, etc. Organic substances in the bones mainly play a role in promoting bone growth, repair of bone tissue, and participate in the role of bone metabolism. 3. Water: The water of bone is the medium for the growth, development and metabolism of bone tissue. The function of bone is to move, support and protect the body; manufacture red blood cells and white blood cells; store minerals.