There has been recent research that suggests that there is a link between vitamin D deficiency and multiple sclerosis, especially people living in Northern climates such as Canada, where shortened days mean less vitamin D absorbed from the sun.

The research in Canada and the UK believe that a vitamin D helps to control a gene that predisposes people to the disease. It is now thought that it is especially important for pregnant women to make sure they have enough of the vitamin during gestation.

If you drink enough fortified milk and get adequate sun exposure, you probably don’t need extra supplements, but if you are lacking in either of these or are pregnant, supplementation may be recommended.

In addition, the Canadian Cancer Society is now also recommending adults living in Canada should be taking supplements of 1000 IU a day during the winter.

They believe there is a correlation between vitamin D deficiency and colorectal, breast and prostate cancers.