Letrozole is classified as an Aromatase Inhibitor (AI) drug that is therapeutically used to treat breast cancer. In the performance enhancement scene Letrozole is an invaluable non-steroidal ancillary drug used to mitigate the estrogenic side effects from aromatizing steroids. An aromatase inhibitor is recommended to supplement with for most steroid cycles to avoid the onset of adverse side effects. Letrozole is the strongest and most suppressive commonly used aromatase inhibitor.

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Letrozole (2.5mg x 50)

Letrozole (Letrogen), also known as Femara, is the strongest and least frequently used Aromatase Inhibitor (AI) drug which becomes invaluable to supplement with for those running steroid cycles with aromatizing compounds. Where SERMs bind to estrogen receptors, effectively blocking estrogen from binding to them, Aromatase Inhibitors (AIs) function by blocking the initial formation of the aromatase enzyme, which is a byproduct of administering most anabolic steroids. Letrozole use is rarely supplemented with by steroid users, as it completely decimates the body’s serum estradiol levels, inhibiting the aromatase process, mitigating the potential adverse side effects. Most steroid cycles require an AI to prevent elevated estrogen levels and the related side effects. If the effects have already manifested, then a Selective Estrogen Receptor
Modulator (SERM) such as Raloxifene should also be utilized to counter the existing elevated estrogen levels from worsening and to reverse the developed side effects (gynecomastia, water retention, erectile dysfunction, etc.). Letrozole is commonly used pre-contest by competitive bodybuilders looking to decrease/kill estrogen levels to appear esthetically dry and hard.


● Strongest aromatase inhibitor
● Inhibits the conversion of testosterone into estrogen
● Elimination of estrogenic side effects
● Raises natural testosterone secretion levels
● Reduces blood pressure
● Medication for treatment/prevention of breast cancer


● 24 hours

Possible Dosage & Cycle Length:

● Men @ 0.5-1 mg/every other day (EOD), only as needed to mitigate side effects
● Letrozole use should be short term, 7-14 days to reverse gynecomastia, or pre-contest
for bodybuilding competition

Related Products:

● Clomid, Raloxifene, Arimidex, Aromasin


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