Vitamin D is also known as the sunshine vitamin. It is produced by our body when the skin is exposed to natural sunlight. Intense sunbathing has been shown to increase the risk of skin cancer, so it is recommended to protect yourself adequately. Therefore, many of us do not get enough sunlight. Because of their advanced age, many people can not convert vitamin D into their active form. Therefore, a variety of people suffer from vitamin D under-supply. It is very difficult to absorb a sufficient amount of vitamin D over the normal diet.