Compare to Women's Rogaine® active ingredient. Hair Regrowth Treatment For Women, Minoxidil Topical Solution 2% contains minoxidil, the #1 dermatologist recommended active ingredient for hair regrowth (of U.S. physicians surveyed by an independent market research firm). Works beneath the surface to reactivate hair follicles to stimulate hair regrowth on top of the scalp. For women who have a general thinning of hair on the top of the scalp. Unscented.