Older men with lower levels of free, or unbound, testosterone circulating in their bloodstreams could be at higher risk of developing Alzheimer’s disease (AD) than their peers, according to research conducted by investigators at the National Institute on Aging (NIA), one of the National Institutes of Health, and others*. This prospective observational study is believed to be the first to associate low circulating blood levels of free testosterone with AD years before diagnosis.
The study appears in the January 27, 2004 issue of the journal Neurology.
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