Rogaine Men's Hair Loss & Thinning Treatment is a topical solution that is clinically proven to regrow hair in men with hereditary hair loss. It contains the active ingredient minoxidil, which works by revitalizing hair follicles and stimulating hair growth. The treatment is easy to use and should be applied directly to the scalp twice a day. With regular use, users can expect to see visible results in as little as 12 weeks, including regrowth of thicker, fuller hair.