Vitamin D (calciferol) is a fat-soluble vitamin that helps support strong bones, maintain muscle function, strengthen the immune system, and promote mental well-being. Vitamin D has two forms: vitamin ...

Although your body will store excess vitamin A, some research shows having more than 1.5mg a day over many years may weaken bones. In older people, this can lead to fractures as they are more ...

Vitamin D is one of many vital nutrients your body needs to stay healthy. It helps with calcium absorption and bone health. Without enough vitamin D, you may be at risk for bone loss and deformations.