The best multivitamin for you -- and 11 to steer clear of - CNN.com/health

You've been told for years that popping a multivitamin every day might help you live longer. But the daily multi habit has been getting a bit of bad press lately.

First, ConsumerLab.com, a watchdog of the supplement industry, found that more than half of the 21 multis it tested had too much (or too little) of certain vitamins -- or had been contaminated with dangerous substances such as lead. Then a controversial paper from researchers in Denmark and other European countries, published in the Journal of the American Medical Association, made the claim that taking vitamins may actually shorten your life.
What's the real story?

Health talked to leading nutrition experts at Harvard and Tufts universities to find out and to get some answers on this and other confusing info about vitamins.