维生素以D(含D_2和D_3两种结构状态）是人体发育和维持健康的要素，在体内与钙、磷的代谢密切相关，可加强钙、磷在肠道内的吸收，并可促进骨的钙化过程。维生素D对儿童的正常发育和预防软骨病将起到重要的作用。但过量服用维生素D，也可引起毒副反应，在临床上表现为高钙血症 Vitamin D (including D_2 and D_3 two structural states) is the human body to develop and maintain healthy elements in the body and calcium and phosphorus metabolism is closely related to calcium and phosphorus can enhance the absorption in the intestine and can promote bone calcification process. Vitamin D will play an important role in the normal development of children and prevention of rickets. However, excessive intake of vitamin D, can also cause side effects, clinically manifested as hypercalcemia