Vitamin D regulates the expression of hundreds of genes and is integral to biological functions that affect every bodily system. Vitamin D insufficiency or deficiency can trigger several generalized symptoms that you may have associated with other health conditions.

https://www.theepochtimes.com/mkt_breakingnews/do-you-know-the-signs-of-vitamin-d-deficiency_3723414.html?utm_content=Pos_Do_You_Know?