Buy Manufacturer 99.2% Raw Aromatase Inhibitor Drugs Letrozole (Femara) Powder Letrozole Description Letrozole is a type II (non-steroidal) third generation aromatase inhibitor. Clinically it is used to treat postmenopausal women with either estrogen receptor positive or estrogen receptor unknown breast cancer. For pre-contest bodybuilders, Letrozole is almost a necessity to eliminate water retention and achieve the ripped look necessary to …