Answer to the question: no Patchouli Zhengqi Shui is not a prescription for gray nails. The main ingredients of Huo Xiang Zheng Qi Shui contain Cang Zhu, Chen Pi, Poria, Sheng Half Xia, Patchouli oil, etc. It is mainly used for relieving the surface and dissolving dampness (relieving the evils of the external senses and getting rid of dampness in the body), regulating qi and zhongzhong (regulating the qi of the spleen and stomach to make the functions of the spleen and stomach smooth), and treating some gastrointestinal colds caused by vomiting and diarrhea, and other symptoms. Some people believe that patchouli Zhengqi Shui can treat gray nails, possibly due to the mistaken belief that the alcohol content in patchouli Zhengqi Shui has a mild inhibitory effect on skin fungi. In fact, the alcohol content in patchouli water is limited and contains a variety of ingredients that not only make it difficult to inhibit fungus, but wrong use can also lead to infection. Patients with gray fingernails should consult a dermatologist for a correct diagnosis and use the medication under the doctor’s guidance to avoid adverse reactions or delayed illness.