I understand that you are all trying to be helpful, but I would really recommend against answering on these kinds of forums with "what you've heard".  If you have read it in a book or on a health professionals' website, please include the reference. Otherwise, you may cause people to waste their time and money trying treatments that have no medical background whatsoever.

Here is what a physician from the Mayo Clinic has to say:

http://www.mayoclinic.com/health/nails/AN00591