For those who are used to taking multivitamins every morning, a new study has revealed that consuming them may actually be of no use. 

While multivitamins aren't helpful, at least they're not harmful. But the money people spend on them could be better spent on purchasing healthy foods, according to Dr. Pieter Cohen, an associate professor of medicine at Harvard Medical School.

Researchers analysed 84 studies involving nearly 700,000 people. Their review, published in JAMA, found little or no evidence that taking vitamin and mineral supplements helps prevent cancer and cardiovascular disease that can lead to heart attacks and stroke, nor do they help prevent an early death.