If only it was as simple as popping a supplement and being set for life. But alas, no. iStockphoto.com hide caption itoggle caption iStockphoto.com Shots - Health News More Evidence Against Vitamin D To Build Bones In Middle Age October 12, 2013 A review of clinical trials using vitamin D to build bone density in middle-aged women finds that it doesn't help. That may be because those women aren't generally low on calcium and that D helps the body absorb calcium in the gut only if it's seriously lacking. It may do more good in the elderly.