Vitamin D's importance in maintaining strong, healthy bones through its interaction with the essential mineral, calcium, is well known.  But the vitamin is also vital for the health of the nervous and immune systems, in regulating insulin levels and blood pressure, and even as a possible protector against certain common cancers.

The best known and most serious disease associated with vitamin D deficiency is rickets, which arises when the deficiency causes blood calcium levels to fall too low, and the body to respond by stripping the bones of calcium leading to loss of bone  density and malformation.

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