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The Sources and Health Benefits of Vitamin D

Vitamin D is in fact a group of vitamins, D1 , D2, D3, D4 and D5. However, it is D2 (ergocalciferol or calciferol) and D3 (cholecalciferol) which are the main D vitamins. This group of vitamins are called prohormones.

Many people are familiar with the sun being a source of vitamin D, and it is the D3 vitamin which is obtained through exposure to the sun. D2, however, is obtained through plant and fungus sources.

The Role of Vitamin D in the Human Body

Vitamin D has a partnership role, particularly with calcium and phosphorous. The vitamin D helps the regulation of phosphorous and calcium in the blood, assisting their absorption from food in the intestine, and then the reabsorption of calcium into the kidneys.

Vitamin D is especially important in the maintenance of the bones, and is crucial to skeletal strength. Vitamin D can greatly increase the absorption of calcium, and a deficiency in this vitamin can lead to bone problems such as rickets in children, and Osteomalacia and Osteoporosis in adults.

Vitamin D is thought to be beneficial to the immune system, and some recent scientific studies into vitamin D have looked at its possible role in cancer prevention. There is scope for much more study in this area, and it may turn out that Vitamin D is even more important than previously thought.

Given the difficulty in finding natural sources of the D vitamins in sufficient quantity, it is common practice in some countries to now fortify some foods with Vitamin D. It is likely, for most people, that they would, or do, benefit from vitmamin D supplementation.

There are few natural food sources for Vitamin D, but oily fish are a good source, notably salmon, canned tuna, eel and sardines. A whole egg is another natural source of vitmain D.