Vitamin D is a fat-soluble vitamin that is considered to be important to the healthy function of the human body. Currently, several different types of Vitamin D have been identified, including ergocalciferol (Vitamin D1) and cholecalciferol (Vitamin D3). Various types of Vitamin D are helpful in the bloodstream as well as in promoting healthy bone formation and maintenance.

Many claims for the importance of Vitamin D in the daily diet are supported by modern research. Both traditional and alternative medical practitioners make use of the vitamin when dealing with such ailments as alcoholism, constipation, cramps, eye infections, and various types of allergies. One of the reasons for the varied applications of Vitamin D has to do with the fact that the vitamin helps to regulate the absorption of other vitamins and minerals in the bloodstream.

There are a number of food sources for Vitamin D. Dairy products such as milk, butter, and egg yolks are excellent sources of the vitamin. Tuna and sardines also provide substantial amounts of Vitamin D and are easily absorbed by the body. Several green leafy vegetables such as spinach provide a good source of the vitamin in a single serving.

Several common herbs are also excellent ways to include Vitamin D in daily consumption. Eyebright, alfalfa, and fenugreek provide helpful amounts of the vitamin. The consumption of these herbs can be an excellent way for persons with dairy allergies or who choose to enjoy a vegan diet to still get enough Vitamin D in the diet. Vitamin D supplements in capsule and tablet form is also available.

Along with consuming foods or taking supplements as a means of receiving Vitamin D, short periods spent in sunlight will also help. Direct contact with a limited amount of natural sunlight helps to produce Vitamin D3 in the body. The same effect cannot be obtained with the use of artificial light.

Deficiencies in Vitamin D can lead to softening of the bones in the body, as well as decreasing the ability of the body to make use of calcium and phosphorus. The ability of the blood to clot may also be decreased. In some instances, a Vitamin D deficiency can have an impact on the ability of the brain and nervous system to respond properly to stress, decrease the efficiency of the liver, and even be the trigger for heart palpitations. There is also some evidence that a lack of Vitamin D can lead to the development of colon cancer.