The main source of vitamin D is the sun’s rays, so in the darker months of winter and early spring, when we’re not getting as much sunshine, our levels tend to be low. March and November are the best months to ask your healthcare provider about the 25-hydroxy D blood test, says immunologist Aileen Burford-Mason, a founding partner of the Holistic Health Research Foundation of Canada. The test indicates the amount of vitamin D in your blood, and can help your healthcare professional determine the best ways to boost your levels if needed. Vitamin D deficiency has been linked with many cancers.
To make sure you get enough vitamin D all year round, choose from food sources such as tuna and eggs, and top up with a supplement. Health Canada recommends 200 IU (international units) daily for women up to age 50, but other experts say you should really be getting 1,000 IU daily.