Used primarily in oral contraceptive pills, it works by preventing ovulation and altering cervical mucus to inhibit sperm penetration. It is also part of hormone replacement therapy in some cases, helping regulate menstrual cycles and treat symptoms of hormonal imbalances. Its high progestogenic activity makes it effective at low doses, reducing the risk of side effects. Often combined with ethinyl estradiol in birth control formulations for improved efficacy and cycle control.