Often the fingernail is merely reflecting what is going on inside the body. When I have worked with people with fungus, they often would build their immune systems and take products specific to combatting yeast and fungus. You can look at one on our other site at http:www.theherbsplace.com/yeast.html
Also, you can use our search engine on that site and look for the word yeast. This should begin to give you some background.
Hope that helps.
Randal Watkins, Editor