Below, we get into what vitamin D is, the symptoms of vitamin D deficiency, and how to provide your body ... is to visit your primary care doctor and ask for a test called the 25-hydroxy vitamin D ...

Vitamin D Deficiency Symptoms Your body needs vitamin D to absorb calcium, and calcium is crucial to bone health. Vitamin D is also important to muscles, the nervous system, and the immune system.

they had a serum 25-hydroxy vitamin D level between 10 and 30 ng/mL. Anything below 30 ng/mL is considered insufficient, while values less than 20 are classified as vitamin D deficiency.

The groups who benefited the most were non-Westerners, those who started with a 25-hydroxy vitamin D level of less than 15.0 ng/mL (below 20 ng/mL is generally deemed to be vitamin D deficiency ...