Add Yahoo as a preferred source to see more of our stories on Google. While most people don’t get enough vitamin D—a nutrient that’s crucial for bone and muscle health—it is possible to get too much.

A seemingly harmless dietary supplement can have serious consequences when taken in large amounts.

Here’s what vitamin D3 is and why your body needs it.

I am confused about vitamin D. I have been taking it for years, along with calcium, to protect my bones. Recently, I read that there is no evidence it works and that too much could be harmful. Can you ...

Some two-thirds of Americans don’t get enough bone-strengthening vitamin D. That’s especially true during the cold and dark winter months when people are deprived of the vitamin D provided by the ...

NEW YORK -- Doctors are warning about vitamin D again, and it's not the "we need more" news you might expect. Instead, they say there's too much needless testing and too many people taking too many ...

WEEK, JUST IN TIME FOR THE 4TH OF JULY. WELL, IN THIS MORNING’S WOMAN’S DOCTOR, WE ALL GET VITAMIN D FROM BEING IN THE SUN, BUT HOW MUCH DO WOMEN REALLY NEED? WOMEN AGES 30 TO 70 NEED ABOUT 600 ...

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." ...

Vitamin D is an essential nutrient for your immune system, heart health, and more. However, most Americans don't get enough ...

DOCTOR, WE ALL GET VITAMIN D FROM BEING IN THE SUN. BUT HOW MUCH DO WOMEN REALLY NEED? MERCY MEDICAL CENTER DOCTOR ERNESTINE WRIGHT JOINS US NOW WITH MORE INFORMATION. GOOD MORNING. THANK YOU FOR ...