Vitamin D has been known as the sunshine vitamin because the body can make it upon exposure to sunlight. But what about people who live in northern climates where sunlight is insufficient in the wintertime? A new study of Canadians found that one-third of them did not have adequate blood levels of vitamin D in the wintertime. Nearly half of the non-white Canadians studied had blood levels that fell short. Vitamin D supplementation was associated with higher blood levels of the vitamin and much less seasonal variation. The investigators conclude that food choices alone are not able to maintain adequate vitamin D levels in the winter.
[American Journal of Clinical Nutrition, July, 2011]
Our Guide to Vitamin D Deficiency has more details on blood levels and supplements.
7/20/2017 Redirected to: https://www.peoplespharmacy.com/articles/extra-vitamin-d-no-benefit-for-kids-with-colds/
