
Why Vitamin D Isn’t Really a “Vitamin”
Vitamin D: Is It Really a Hormone? Most people think of vitamin D as just another vitamin — something you take for bone health or immunity. But biologically speaking, vitamin D is not a true vitamin at all. In fact, vitamin D functions more like a hormone in the body. Understanding this distinction helps explain why vitamin D deficiency can impact so many areas of health — including energy levels, immune function, inflammation, mood, and even hair loss. Why Vitamin




