Molecular weight
285.3 Da
FDA-approved breast cancer. Off-label fertility induction (often preferred over clomiphene). Off-label in men for hypogonadism. Most aggressive estrogen suppression — requires careful monitoring in men.
Most potent non-steroidal reversible aromatase inhibitor. Reduces estradiol by >99% in postmenopausal women. Triazole derivative — competitive reversible binding to CYP19A1 heme iron. More potent than anastrozole in comparative studies. Used in fertility: stimulates FSH/LH via reduced estrogen feedback.
Most potent AI; >99% E2 reduction; fertility induction off-label; FDA-approved breast cancer; aggressive monitoring needed in men.
Research data is not a treatment plan. If you are considering Letrozole, the questions that matter are whether it suits your history, your labs and your goals. That is a conversation with a licensed physician, not a lookup.
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Reconstitution calculator · Full deep dive · Peptide fundamentals