The role of estradiol in males: Implications for libido and testosterone replacement therapy.

Nelson Vergel

Founder, ExcelMale.com
estradiol1.jpg

Historically, when we think of sex hormones in men and women, we identify testosterone as the core regulator of orderly male growth and sexual function. In a similar fashion, we identify estrogens central to regulating sexual and reproductive function along with a host of non-reproductive functions in women. 17ß-Estradiol or E2, the principal form of estrogen, is also produced in significant quantities in males. Research over the last two decades has demonstrated that estrogens can play a pivotal role in regulating male sex drive, erectile function, spermatogenesis, and can also be responsible for body fat distribution, bone density, and overall morbidity and mortality. High estradiol, however, is known to cause breast tissue growth (gynecomastia) and water retention in men. Because of this dynamic, regulation of the balance of testosterone and estradiol in males is paramount. Although there is evidence to suggest that lower levels of estradiol (10-20 pg/ml) can increase bone loss, the impact of high levels of estrogen on male reproductive function and other morbid conditions is complex, and it is difficult to discern upper values for the optimal range where deleterious effects begin to occur. The impact of both estrogen deficiency and excess remains controversial. We present here a background of estradiol in men along with studies that highlight the importance of estrogen in male physiology.

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Understanding Your Hormones

Estradiol (E2)

A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

DHT

Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.

Free Testosterone

The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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