Functional lab tests that look at hundreds of biomarkers are everywhere. Doctors explain whether you need one, or if ...

What Exactly Is Vitamin D? Despite its name, vitamin D isn't a vitamin—it's a hormone. Unlike traditional vitamins that we ...

OU Health's Dr. Catherine Mims explains why vitamin D is critical for bone, brain, and immune health, and how to safely maintain healthy levels year-round.

Low vitamin D levels can cause muscle weakness, cramps and bone pain. You'll generally feel muscle weakness in your upper ...

Vitamin D is essential because it helps the body regulate calcium and phosphate levels and keeps bones, teeth and muscles healthy. It’s found in foods like oily fish, red meat, egg yolks and ...

Nearly a quarter of Americans are estimated to have a deficiency in vitamin D. How can you make sure you're getting enough? Here's what experts say.

Wondering how to increase vitamin D levels in your body? Here's what you need to know about the three ways to do it.

It may feel nearly impossible to scroll through social media these days without seeing ads for trendy, pricey functional ...

OU Health's Dr. Catherine Mims explains why vitamin D is critical for bone, brain, and immune health, and how to safely maintain healthy levels year-round.