Anastrozole is an aromatase inhibitor used in testosterone replacement therapy (TRT) protocols to manage estrogen levels and maintain hormonal balance. When testosterone levels rise, some of it can convert to estrogen—a process called aromatization. Elevated estrogen in men can lead to symptoms like water retention, mood swings, gynecomastia, and reduced libido. Anastrozole helps block this conversion, keeping estrogen in an optimal range while preserving the benefits of TRT. Used carefully and in low doses, it ensures a more stable, effective, and symptom-free testosterone optimization journey.