Regaine ( Rogaine ) is the only clinical proven topical hair thinning treatment for women. Clinical tests have shown that Regaine ( Rogaine ) can help stop Hair thinning in 4 out of 5 users. Some women even experience hair regrowth. That explains why Regaine is trusted by over 5 million people worldwide. Regaine works by increasing the blood supply and nutrients to the follicle of the hair. Apply Regaine to the hair with a gentle massage motion twice a day. The massage and Regaine will stimulate the hair follicle. This results in the dead hair falling out and new hair grows. With continuous Regaine use, thicker hair regrowth is likely.