A vitamin D test measures your blood's vitamin D levels to see if they are too high or too low. Low vitamin D levels can ...

Some vitamin D tests may give misleading results despite progress made in recent years to improve the quality of these assays, according to the US Centers for Disease Control and Prevention (CDC).

Millions of Americans take a daily vitamin, assuming it is doing something. That assumption is not always correct. The gap ...

In a small but revealing study, scientists discovered that tears strongly mirror blood glucose and saliva may reflect vitamin D status. This could lead to less invasive ways to monitor chronic health.

Dr Anjali Kumar explains why vitamin D deficiency is extremely common among women and how a simple blood test can help detect ...

Sometimes it may feel like almost every visit to the doctor includes a dreaded blood draw. Blood tests can reveal a lot about the state of your health. But whether you should get a specific test (and ...

Beyond its effect on calcium and bones, vitamin D is also linked to brain function, mood, and stress regulation, so it is ...

Two new lab tests to measure blood levels of vitamin D are inaccurate more than 40% of the time, according to a new study. Researchers say newer tests tend to overestimate the number of people who are ...

When exposed to sunlight, your body manufactures vitamin D using a type of cholesterol. (Yes, even a certain amount of cholesterol is necessary for good health!) This is why vitamin D is often ...

We know vitamin D is important for our overall health, especially when it comes to maintaining strong bones, but did you know it also plays a key role in brain health? While there’s no proven method ...