I have apparently have genetic hair loss. After age 50 my hair was noticeably thinner. It's gotten very bad and is embarrassing and depressing. The top of my head I tried Rogaine a few years ago and it didn't seem to help then. I think I didn't use it long enough. I'm on it again and I feel like it is helping now, but I'm not sure. If my hair color isn't fresh it's much more noticeable with the roots.... at least it's not visible under the helmet.