The first thing when you test that you have a Vitamin D deficiency（Vitamin D levels less than 10 ng/mL) maybe to take Vitamin D supplement, many doctors also recommend taking Vitamin D supplements. Is that correct?

Why do we lack vitamin D? There are several reasons

Why do we have a Vitamin D deficiency? There are several factors:

1. Eating very little food with vitamin D
2. Not enough time outside in the sun
3. Darker skin pigment
4. Kidney or liver failure, which prevents the body from adequately processing vitamin D

If you are in good health but suffers from vitamin D deficiency due to insufficient exposure to sunlight, dark skin pigment, or nutritional problems, more food with Vitamin D or vitamin D supplements will be a good choice. 

 However, if the vitamin D deficiency is caused by Kidney or liver failure,  which prevents the body from adequately processing vitamin D,   Vitamin supplement will be not good choice. In such cases, treatment is required for the intestinal and liver diseases.

Therefore, Vitamin D Test is not only about knowing the level of VD, according to the Vitamin D testing, you also can know the your physical health status.