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2. Erectile Dysfunction. Results are preliminary, but it is clear that estrogen in males actually plays a significant role in nitric oxide production.  Of course, it is no secret that testosterone stimulates nitric oxide, but researchers were suprised to find that in men there were critical estrogen receptors that stimulate eNOS as well. Therefore, it may be almost as important to check estrogen levels as testosterone in aging males.
3. Verbal Memory and Brain Function. Estrogen is critically important for brain function, even in the men. Researchers have found that it is important for verbal memory in particular.  Estrogen is also essential for the growth of new neuronal connections and neuron maintenance.  Yes, testosterone has a profound effect on the male brain, but adequate estrogen is no less important.
Many experts emphasize that the criticality of the ratio of testeosterone to estrogen. For more information, read my link on The Testosterone-to-Estrogen Ratio, where I discuss how it changes over the years and even how Cialis can affect it in a positive way.
CAUTION: I had one extremely fit and athletic young man write in who was taking a variety of supplements and foods that decreased testosterone's aromatization to estrogen. This included zinc supplementation and green tea extracts (EGCG). His claim was that, because he was so thin and had very low body fat, that his estrogen was likely too low and leading to a variety of health issues. It may be something to consider for the young and fit.
1) Arch Intern Med, 2008, 168(1):47-54, "Endogenous Sex Hormones and Incident Fracture Risk in Older Me: The Dubbo Osteoporosis Epidemiology Study"
4) Med Sci Monit. 2003 Mar;9(3):RA63-8, "The nongenomic protective effects of estrogen on the male cardiovascular system: clinical and therapeutic implications in aging men"
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