Average Vitamin D Levels by Age Group The 25-hydroxy vitamin D blood test can determine vitamin D levels. The results may be reported in nanograms per milliliter (ng/mL) or nanomoles per liter ...

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.

"The most reliable way to check vitamin D levels is a blood test, and consultation with a healthcare provider is recommended for personalized advice," Thomason says.

Too little vitamin D is tricky to spot, a registered dietitian nutritionist told The Post. She shared some signs of vitamin D deficiency and how to know if you should be taking a supplement.

Most people naturally have good vitamin D levels. Overhyped claims that the compound helps to fight diseases from cancer to depression aren’t borne out by recent research ...

1. Vitamin D is crucial for maintaining immune function, which is particularly important as we enter the cold and flu season.

The only way to get an official answer on whether your vitamin D levels are too low is through a blood test, but the symptoms include fatigue, muscle pain, and general weakness.

Very high levels of vitamin D can elevate blood calcium levels, raise heart-disease risk, and even kill you. Experts tell how much you should get.

How Vitamin D Levels May Influence Psoriasis Severity Previously, research on the connection between vitamin D levels and psoriasis severity was limited.

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.