For skin or nail fungus I have found thyme essential oil to be the most effective treatment. Dilute with an equal amount of coconut, which is also antifungal, before application. For nail fungus you should also cut the nail back as much as possible and file the top down some to expose the fungus in the inner nail. Keep cutting the nail back and filing down the top as it grows out. It will take about 6 months or so for the healthy nail to grow out.