Vitamin D is vital for immunity, brain health, strong bones, and overall well-being, but taking in too much from supplements ...

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).

How to use an at-home vitamin deficiency test For any further questions, all reputable at-home tests will have instructions and a customer care line. Most vitamin deficiency tests require a blood ...

A doctor explains who truly needs a vitamin D supplement in the winter, how to tell if you're deficient, and when ...

Vitamin D is an essential micronutrient that's an important part of a healthy diet. Learn what types of foods are rich in vitamin D.

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.

If you ask most conventional doctors whether they take supplements themselves, the chances are they will reply that they do ...

The pancreas contains Vitamin D receptors, which enable Vitamin D to affect insulin production, as well as the muscle and fat ...

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 ...

When Mayo Clinic researchers began studying vitamin D’s effects on older adults’ blood pressure, they didn’t anticipate the fascinating results that would emerge. Their discoveries about this common ...