It noted two studies that showed vitamins and calcium could both benefit and increase the risk of breast cancer and a third that showed B vitamins could lower heart disease risks.
A Puerto Rican study noted those who took multivitamin supplements reduced the odds of having breast cancer by 30 percent, with those who took calcium reducing the likelihood by 40 percent. Supplements such as vitamins A, C and E had no effect.
A Swedish cohort study of more than 35,000 Swedish women found those who reported taking multivitamins were 19 percent more likely to develop breast cancer than those who said they didn't take them.
A Japanese study looked at more than 23,000 men and 35,000 women, ages 40 to 79. There were fewer heart failure-related deaths in men among those that took folate and vitamin B-6.
“These nutrients were also linked to fewer deaths from stroke, heart disease and overall cardiovascular diseases in women,” CNN observed.