but it is essential that the skin is exposed to sunlight to obtain the recommended daily allowance of the D vitamin. the amount of time that you have to spend in the sun to receive a sufficient dose of the vitamin d is extremely small and just a few minutes a day will be enough. This will not have any adverse effects from the amount of ultra-violet light received.
The most important function of the vitamin D is to help control how much calcium is absorbed from the food you eat. It is the D vitamin that ensures that there is always sufficient calcium in the blood to perform these tasks.
There are also more functions that require the D vitamin relate to the immune system and it is believed that it is also a contributing factor in reducing the risk of contracting cancer and, in particular, colon cancer. D vitamin that is formed under the skin is known as vitamin D3, or cholecalciferol. This D vitamin is created when the ultraviolet in the sunlight reacts with a type of cholesterol that is found under the skin naturally. The D3 is converted into a more active form of the d vitamin in the liver and is then diverted to where it is needed the most in your body. This vitamin remains in the liver and kidneys to help reabsorb the calcium from the blood.