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 ...

Possible Reasons, and The Best Labs for Fatigue Key Takeaways: Fatigue describes more than just feeling sleepy — it’s a ...

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.

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).

Discover if the "sunshine vitamin" is the missing link in your cardiovascular routine and how it interacts with your arteries ...

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 ...

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 ...

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 ...

High calcium levels from vitamin D toxicity can disturb the heart’s electrical system. This can lead to palpitations, ...

Too much vitamin D can harm your health. Know the warning signs, side effects, and safe ways to manage your vitamin D levels ...

At-home vitamin deficiency tests are available from online retailers, including LetsGetChecked, Everlywell, MyLab Box, and more. Popular test kits can measure a person’s vitamin D, B12, or iron levels ...