Patchouli is not able to treat gray nails. The main ingredients of this medication are patchouli, Chen Pi, Daji Pi, and other Chinese herbs, plus a certain amount of alcohol, so this medication, even if used for skin diseases, is mainly for eczema, skin diseases formed due to factors such as dampness and heat, and only temporarily relieves symptoms. The actual fact is that these ingredients are not antifungal at all, and at most they play a local disinfection role. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things.