The benefit of shampooing hair with sidecarp leaves is that it has some effect on hair loss or early whitening of beard hair caused by blood heat (heat evil causes blood to go out abnormally), but the effect of external use is limited. The harm is that the use of those who are prone to allergies may cause skin rashes, itching and so on. According to Chinese medicine, lateral cypress leaves are bitter, astringent and cold in nature; they are attributed to the lung, liver and large intestine meridians. It has the efficacy of cooling blood and stopping bleeding (making blood cool and moist, preventing bleeding), resolving phlegm and relieving cough, and regenerating hair. It is suitable for bleeding disorders such as vomiting blood with blood heat, epistaxis, urinating blood, bloody dysentery, coughing with lung heat, hair loss with blood heat, and whitening of beard and hair early. Some allergic individuals may be allergic to certain components in the leaves of cypress, which may cause skin allergic reaction, manifesting as red rash and itching on the skin at the site of contact. If patients with hair loss or early whitening want to rely solely on the side of the cypress leaves to wash their hair, then the effect may not be very significant, it is recommended to treat the symptoms. If there is a need for medication, you can go to a regular Chinese medicine hospital for diagnosis, and then under the guidance of the doctor to use medication.