Minoxidil is the only FDA-approved topical medication approved to treat hair loss. Better known by its brand named, Rogaine, it works by stimulating follicles to regrow hair. It comes in foams for men and women; both use 5 percent minoxidil, but women should apply Women's Rogaine Unscented Foam, $26.99, once per day as opposed to the twice-daily application for men. (Don't worry, if you do use the men's version, you won't grow hair on your chest or experience other adverse effects, but you'll probably save a few dollars!) The good news: In three months, you should see up to 25 percent more hair, and the new strands grow back thicker than before. But to retain that hair, you'll need to continue using the product.