钙是人体含量最多的矿物元素，其９９％存在于骨骼及牙齿中。钙代谢异常时，骨骼、牙齿受累，尤以处于生长期的骨骼受损更为明显。已知参与调节钙平衡的激素有维生素Ｄ、甲状旁腺素（ＰＴＨ）、降钙素（ＣＴ）及雌激素，肝、肾及肠道功能也起重要的作用。一旦调节失衡均可引起 Calcium is the most abundant mineral element in the body, and 99% of it is found in bones and teeth. Abnormal calcium metabolism, bone, teeth involved, especially in the growing period of bone damage more pronounced. It is known that vitamins D, PTH, CT, estrogen, liver, kidney and intestine are also involved in the regulation of calcium balance. Once imbalances can be adjusted