Icariin is not effective in treating gray nails. If you have gray nails, you should consult a doctor for antifungal treatment under the doctor’s guidance. Patchouli Zhengqi Shui, the name of Chinese patent medicine, is composed of Cangzhu, Chenpi, Houpu, Angelica dahurica, Poria, Dabu Pi, Sheng half-sia, patchouli oil and so on. It has the effect of relieving surface and dampness, regulating qi and harmonizing the middle. It is used for cold and flu caused by external wind-cold, internal dampness and stagnation or summer dampness, with headache, chest and diaphragm plagued, epigastric distension and pain, vomiting and diarrhea; gastrointestinal cold and flu with the above symptoms. Adverse reactions to Iohexium Zhengqi Shui include nausea, vomiting, itching, flushing and so on. Allergic to the product, alcohol allergy is prohibited. Precautions, avoid smoking and alcohol. Severe vomiting and diarrhea need to go to the hospital. This product should not be taken in excess or for a long period of time. Before taking this medicine, it should be used under the guidance of a Chinese doctor to identify the symptoms, and should not be purchased and used on its own to avoid delaying the condition.