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arimidex, also known as anastrozole, is shown to be an effective aromatase inhibitor in men.  These case studies used arimidex to successfully stimulate testosterone production by limiting testosterone to estrogen production.  This was found to be useful in the treatment of gynecomastia.

aromatase inhibitor, arimidex (anastrozole), shown to be effective therapy in male infertility in those with high aromatase activity.  The effect was seen through improved Testosterone:Estradiol ratio through aromatase inhibition.

Aromatase inhibition using arimidex, anastrozole, shown to be an effective therapy to raise testosterone levels in men with low T and high aromatase activity.

aromatase inhibition with arimidex, anastrozole, shown to be effective therapy to raise testosterone in elderly men with low T.

Study looked at aromatase activity in androgen production in older men.  The study found that aromatase inhibition with arimidex increased Testosterone production.  PSA was also monitored and PSA increased in the smaller dose group versus the high dose group.

aromatase inhibition with anastrozole, in this study, resulted in impaired flow mediated dilation.  No resultant change in inflammatory markers were seen.  Again, my problem with this study is the use of serum for the hormone evaluation.  I would bet not enough aromatase inhibition was provided.

aromatase inhiibition via anastrozole decreased Estradiol and allowed for an increase in Testosterone production.  Estradiol has a negative feedback at both the hypothalamus and the pituitary.

Letrozole has more AI activity than anastrozole.