The Surprising Way to Supercharge Your Vitamin D -- Even When It's Arctic Outside

Between the Bomb Cyclone that recently hit the Northeast to the Icepocalypse currently shocking the South, more of us than ever are feeling that winter cabin fever -- snowbound indoors and trying to make the most of it by celebrating all things hygge. But if you're worried about getting your vitamin D even when it's totally inhospitable outside, this one simple trick is nearly as good as sunlight.