Vitamin D is a group of fat-soluble substances (calciferols) of which the most important are D2 and D3.The liver and kidneys convert vitamin D to the active form called calcitriol that is used to regu..

You're probably familiar with traditional scrapbooking done with paper and printed photos. But there are a growing number of people who are using their computers to create unique scrapbooking pages. I..