Vitamin D is one of the most common nutrient deficiencies I see in my practice. Studies show that 40% of Canadians have insufficient vitamin D blood levels in the winter, and 25% have insufficient levels in the summer (1). This widespread deficiency is concerning, because vitamin D plays such an important role in so many areas of our health. Vitamin D helps maintain calcium homeostasis and healthy bone mineral density, and plays a role in prevention of breast and colon cancer, cardiovascular disease in men, and seasonal affective disorder (2,3,4,5,6,7). Vitamin D also has a huge influence on the health of our immune system, and a deficiency of this critical vitamin can increase the risk of
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