Dr Steven Lin - In the Northern hemisphere as Winter approaches, in most places, you will produce no vitamin D from the sun. If you live above 37 degrees north or south
![Research suggests children in northern latitudes more likely to be vitamin D deficient in winter | CTV News Research suggests children in northern latitudes more likely to be vitamin D deficient in winter | CTV News](https://www.ctvnews.ca/polopoly_fs/1.3649622.1509018195!/httpImage/image.jpg_gen/derivatives/landscape_1020/image.jpg)
Research suggests children in northern latitudes more likely to be vitamin D deficient in winter | CTV News
![Prevalence of vitamin D insufficiency and deficiency in spring, summer,... | Download Scientific Diagram Prevalence of vitamin D insufficiency and deficiency in spring, summer,... | Download Scientific Diagram](https://www.researchgate.net/publication/51161791/figure/fig1/AS:202858621345809@1425376672837/Prevalence-of-vitamin-D-insufficiency-and-deficiency-in-spring-summer-autumn-and-winter.png)