CBNNews.com  - The largest study ever of multivitamins in older women found they did nothing to prevent common cancers or heart disease.

The eight-year study echoed similar disappointing vitamin studies in men.

Doctors say it's best to get nutrients from food rather than supplements.

But experts say the study does not necessarily show that multivitamins are useless.

Nutritionists say multi-vitamin supplements may still be helpful for people with poor eating habits.