For years I have been talking about how important vitamin D is for the immune system.
vitamin D
Why you need more vitamin D in the winter
The same UVB rays that cause a sunburn also make vitamin D. Sunscreen, darker skin pigmentation, clothing and reduced daylight in winter diminish the skin’s ability to make vitamin D.
Contending with the winter blues, or SAD
It is very common for us to experience the winter blues living in Minnesota with the decreased sunlight, frigid temperatures and relentless snow.
