Wondering if you should bother spending the cash on vitamins and other pills? For most women, the four super supplements are well worth it.
Why You Need It: Not only does D help the body absorb calcium, it also might play a role in preventing colon cancer, breast cancer and diabetes.
Daily Dose: 2,000 international units (IUs) of vitamin D-3 in the winter. In summer, drop down to 1,000 IUs or skip it on days you get lots of sun.