The titles of the article of the Archive of Internal Medicine on older women and supplementation  is misleading. The main culprit seems to be iron supplementation.
Quoting: “…mortality risk…….. is strongest with supplemental iron… In contrast to the findings of many studies, calcium is associated with decreased risk.”
The Nutritional Outlook, , claims that the Iowa women study also shows that : “Use of several common dietary supplements was linked to increased mortality compared to non use… multivitamins, vitamin B6, folic acid, iron, magnesium, and copper [were linked to an increased mortality] …. Contrary to previous research, calcium was linked to a lower mortality risk, as were vitamins C, D, and E, and vitamin B complexes…”The vitamin E result is controversial, since it was linked to lower life expectancy by other studies.
Note that from their “About”: “Nutritional Outlook is a leading resource for the manufacturers of dietary supplements and healthy food and beverages”
Particularly, you should discuss iron supplementation with your health professional
- Archives of Internal Medicine ; “Dietary Supplements and Mortality Rate in Older Women” ; Oct 2011
- Nutritional Outlook; “Study Raises Concern over Dietary Supplements and Mortality Risk” ; Oct 2011
- Cochrane Library ;”Antioxidant supplements for prevention of mortality in healthy participants and patients with various diseases”