Breastfed infants and children with certain medical conditions are also susceptible to vitamin D deficiency. If a healthcare professional has recommended a vitamin D supplement for calcium ...

Vitamin D is essential for immune system function and bone health. It may also influence mood regulation and reduce the risk of several chronic health conditions, but more research is needed to better ...

Some sources of vitamin D include egg yolks, certain types of cheese, fortified foods such as milk, and mushrooms exposed to ultraviolet light. However, few foods contain vitamin D, and those that ...