Dietary Supplements and Mortality Rate
in Older Women: The Iowa Women's health Study
J. Mursu, PhD, et al.
Mursu et al assessed the self-reported use of 15 vitamin and mineral supplements in relation to total mortality in 38,772 women in the Iowa Women's Health Study from 1986 to 2008.
The mean age was 61.6 years at baseline. Taking multivitamins, vitamin B6 and folic acid, iron, magnesium, zinc, and copper was associated with a higher risk of total mortality.
Supplemental iron was strongly and dose- dependantly associated with increased risk of mortality. In contrast, supplemental calcium was associated with decreased risk of mortality. ㅡ Archives of Internal Medicine, vol 171,No.18, Oct 10, 2011
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which have all kinds of minerals, including iron and copper, etc.
This study appears to confirm what I saying.