Where is Vitamin D Made

Vitamin D production depends on multiple organs and that includes skin that gets sunlight exposure,

but it also includes gastrointestinal tract and besides that also liver and kidneys.

So, the most common cause we think about when it comes to vitamin D deficiency is this lack of sunlight exposure.

But chronic inflammatory bowel diseases can cause vitamin D deficiency as well and so can chronic kidney disease.

Vitamin D deficiency is extremely common in liver failure patients.