维生素D是维生素吗?要搞清楚这个问题,先得弄明白维生素与激素的概念。所谓维生素,是指在体内一般不能合成,绝大多数必须由食物供给的一类物质,它不是构成机体的主要原料(指量而言),也不供给能量,但能起调节代谢的作用,一般是酶的辅酶(或辅基)的组成部分。而激素则是由体内某些特定组织或器官合成,不经导管而直接分泌入血液的生物活性物质。它们通过血流到达并作用于靶器官(或靶组织或靶细胞),发挥其生理功能。这种分泌一般受神经一体液及其反应系统的反馈性调节。自从本世纪初叶发现维生素 D 以来,因限于当时 Vitamin D is vitamin? To figure out this issue, first understand the concept of vitamins and hormones. The so-called vitamins, generally can not be synthesized in the body, the vast majority of food must be provided by a class of material, it is not the main raw material constituting the body (in terms of), nor supply of energy, but can play a role in regulating metabolism, It is usually part of the enzyme’s coenzyme (or prosthetic group). However, hormones are biologically active substances that are synthesized by certain tissues or organs in the body and directly secreted into blood without a catheter. They reach and target the target organ (or target tissue or target cell) through blood flow to exert their physiological functions. This secretion is generally regulated by the feedback of the neuronal fluid and its response system. Since the discovery of vitamin D in the early part of this century has been limited to then