When the days shorten and the sun sinks low in the sky, that familiar winter slump sets in. There's a fundamental reason for this seasonal fatigue: low levels of vitamin D—the "sunshine vitamin." ...

If symptoms develop soon after taking a supplement, intolerance to supplement ingredients is also a possibility. Since ...

Your baby needs vitamin D to build strong bones and stay healthy. Here’s why it matters in pregnancy – and how to make sure ...

If you feel tired most of the time, you may suspect it’s from getting older, being busy, or simply one of the joys of modern life. While persistent fatigue is ...

Plus, how much of the vitamin you actually need.

It might help your sleep, too.

As Vitamin D supplementation reaches an all-time high, medical experts warn that "more is not better" when it comes to long-term renal health.

Long-term zinc use may cause copper deficiency, nerve damage, and immune changes. Learn safe daily amounts and when zinc may cause harm.