Letrozole
Letrozole is an aromatase inhibitor commonly used in the treatment of hormone-sensitive breast cancer, particularly in postmenopausal women. It works by blocking the aromatase enzyme, which is responsible for converting androgens (like testosterone) into estrogen. By lowering estrogen levels, Letrozole helps prevent the growth of estrogen-dependent cancer cells.

In the context of bodybuilding, Letrozole is sometimes used by individuals who experience estrogenic side effects from anabolic steroid use, such as gynecomastia or water retention. Unlike other aromatase inhibitors, Letrozole is known for being very potent in reducing estrogen levels. However, it can cause side effects like joint pain, fatigue, hot flashes, and a reduction in bone density with long-term use. Because of its strong estrogen-lowering effects, it should be used with caution, and proper monitoring of hormone levels is essential to avoid excessive suppression of estrogen, which plays a vital role in overall health.