 A new landmark study finding that for healthy adults, taking multivitamins may not actually have the benefits that we all once thought. Researchers looked at data from nearly 400,000 people over 20 years to determine if taking daily multivitamins helped lower the risk of death from conditions like heart disease or cancer. The results showed that otherwise healthy people who took daily multivitamins actually were slightly more likely than non-users to die during that study period.