Medically reviewed by Mary Choy, PharmD Vitamin C supplements are safe for most people, but excessive use or megadosing can lead to several adverse effects. While rare, serious side effects of vitamin ...

It began subtly, with symptoms that could easily be mistaken for a passing illness: nausea, loss of appetite, and a general ...

Vitamin D has long been known to play essential roles in boosting immune health and protecting the nervous system. New ...

Symptoms of a vitamin C deficiency include weakness, bruising, and dry skin. Learn more about the warning signs and how to ...