Why you need more Vitamin D in the winter
- Written by Margherita T. Cantorna, Distinguished Professor of Molecular Immunology, Pennsylvania State University
Vitamin D is sometimes called the sunshine vitamin. FotoHelin/Shutterstock.comWinter is upon us and so is the risk of vitamin D deficiency and infections. Vitamin D, which is made in our skin following sunlight exposure and also found in oily fish (mackerel, tuna and sardines), mushrooms and fortified dairy and nondairy substitutes, is essential...