Rogaine Hair Regrowth Treatment contains the only FDA-approved topical ingredient clinically proven to regrow hair in men and women. If you're among the estimated 30 million women in the U.S. experiencing hereditary hair thinning, you can fight back with Rogaine. And the best time to start is now. Because the sooner you start, the better your chances of regrowing your hair. Active Ingredients: Minoxidil 2% w/v (Hair Regrowth Treatment for Women) Inactive Ingredients: Alcohol (60% v/v), Propylene Glycol (20% v/v), Purified Water.