section_path: Physiological regulation/Vitamin D
section_name: Vitamin D
paragraph_text: Vitamin D
  
  Although cellular studies indicate that vitamin D has receptors and probable functions in the immune system, there is no clinical evidence to prove that vitamin D deficiency increases the risk for immune diseases or vitamin D supplementation lowers immune disease risk. A 2011 United States Institute of Medicine report stated that "outcomes related to... immune functioning and autoimmune disorders, and infections... could not be linked reliably with calcium or vitamin D intake and were often conflicting."