I honestly don't know if they work - at any rate they don't take long to listen to and shouldn't be harmful.
There has been some research done which shows hormone production may be increased:
http://www.binauralbeatsgeek.com/binaural-beat-research.html
There has been some research done which shows hormone production may be increased:
http://www.binauralbeatsgeek.com/binaural-beat-research.html