A recent survey in North America found that many kids and adults did not get enough Vitamin D in their regular diet.. Vitamin D is not only essential for Calcium absorption but can also help your positive frame of mind as being an added "Sunshine" boost when the sun is out of sight.. I have been taking an extra 400 IU / day on top of my multi vitamin and have found a great improvement in my attitude and lack of depression. To me it has made a difference worth sharing. http://ods.od.nih.gov/factsheets/vitamind.asp So do you Vitamin D yourself ?