Role of Estradiol in Men and Its Management

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By Nelson Vergel, BsChE, MBA



Testosterone is the precursor hormone for estradiol. Estradiol is a hormone more abundant in women than men that is produced by the aromatization of testosterone in liver, fat and other cells. Nature created it for a reason. It has been shown to be responsible for healthy bone density but its role in men's sex drive, body composition and other variables is source of great debate. One thing is certain: High estradiol blood levels can cause growth of breast tissue in men :



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When the HPT hormonal axis senses that testosterone or estradiol are high, it automatically decreases or shuts down testosterone production.



Many anti-aging or men's health clinics prescribe anastrozole, a blocker of estradiol production, to men who start testosterone replacement (TRT). Higher estradiol blood levels not only can cause breast tissue growth (gynecomastia) but also water retention (edema). Some people speculate that high estradiol can also lead to erectile dysfunction but no scientific papers have been published on this subject. Since higher testosterone blood levels can originate higher estradiol levels, the belief is that using anastrozole will prevent breast tissue growth and erectile dysfunction by lowering any potential increase in estradiol. However, we have no data on how high is too high when it comes to this hormone in men. Some even speculate that low testosterone-to-estradiol ratios may be more closely correlated to gynecomastia and erectile problems than estradiol alone.



The truth about these speculations is starting to emerge but we still do not have enough data to say what the upper value of the optimal range of estradiol really is. We have a lot of evidence about the lower side of the optimal range since it has been found that estradiol blood levels below 10-20 pg/ml can increase bone loss in men. A recently published study also nicely demonstrated that low estradiol can be associated with higher fat mass and lower sexual function in men. So, be very careful when a clinic wants to put you on this drug without first justifying its use.



Another concerning fact is that many clinics may be using the wrong estradiol test that may be over-estimating the levels of this hormone in men. An ultrasensitive estradiol testmore accurately measures estradiol in men instead of the regular test that costs less.



Click here for more information about anastrozole and estradiol in men
 
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