This study is very interesting because of the popular misinformation that men and post-menopausal women shouldn't take iron supplements.
The only way to know if you do or don't need to take supplements with iron is to have a blood test called "ferritin," which tells you how much iron your body is storing.
The bottom of "normal" for ferritin from most labs is 20 ng/mL. If your ferritin tests below 40 ng/mL the most authoratitive hair loss specialist that I've interviewed, Gary Perrault, MD, says that you are likely to lose hair, whether male or female.
However, he also says that hair will be healthier when ferritin is 70 ng/mL.
Further, low body stores of iron have been shown to be associated with more death from heart attack.
Iron is also one of the nutrients that can help to improve bone density for post-menopausal women, when there is enough.
Since iron is the number one nutrient deficiency in old age in Americans, iron supplementation should be considered by aging men and women.
On a personal note, at 60 years of age, unless I take multivitamins with iron, my ferritin drops to unhealthy levels.
Read more about the iron/Parkinson's study by clicking here.
Yours in health,