Vitamin D is an essential fat-soluble vitamin which performs like a hormone in regulating the bone formation and the absorption of calcium and phosphorus from the intestine. It has its vital role in controlling the movement of calcium between bone and blood, and vice versa. Deficiency of Vitamin D in infancy and childhood can cause the deformed bones characteristic of rickets. Its deficiency in adults causes a softening of the bones known as osteomalacia. Usually it is seen that people of northern countries or people who covered the body with clothes because of tradition dictates, are likely to have Vitamin deficiency. On the other hand, an excess of the vitamin can also cause loss of appetite, weight loss, nausea, headache, depression and deposits of calcium in the kidneys.