Add one more benefit to the many already attributed to vitamin D: it may reduce the risk of uterine fibroids, a type of benign tumor that’s a common cause of infertility and hysterectomy.
Donna Day Baird, PhD, of the National Institute of Environmental Health Sciences, Research Triangle Park, N.C., and her colleagues studied the medical records of 1,036 women, ages 35 to 49 years, who had been screened for uterine fibroids. The women also provided blood samples to measure their vitamin D levels.
Using blood levels of 20 ng/ml as the dividing line between deficiency and sufficiency, Baird reported that only 26 percent of the women had normal levels of vitamin D. Women who said they had sun exposure of at least one hour daily were 40 percent less likely to have uterine...
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