Lateral cypress leaf is a common Chinese herb, which is considered by Chinese medical theory to have the effect of cooling the blood and stopping bleeding, regenerating hair, and can be used for hair loss due to blood heat. If you want to regrow hair through Phellodendron leaf, you need to use it externally under the guidance of a professional herbalist. Since Phellodendron leaf is only effective for blood-heat alopecia, but not for other types of hair loss, you can first roughly determine whether you have blood-heat alopecia. In TCM theory, blood-heat alopecia is characterized by greasy but yellow hair, and is often accompanied by irritability, thirst, nosebleeds, red and yellow urine, and dry stools. If you are diagnosed by a herbalist to be suffering from blood-heat alopecia or have the above characteristics, you can wash and soak fresh raw Phellodendron leaves for a while, then boil them for about 1 hour. When it cools slightly, strain it and use the strained liquid to wash your hair and massage your scalp. If, in addition to hair loss, there is an obvious red rash on the scalp, you can prepare a small amount of fresh cypress leaves, wash and chop them and soak them in medical alcohol, then dip a cotton swab in the solution and apply it to the rash area after 2 weeks to help eliminate the rash and thus relieve hair loss. It should be noted that if there is significant hair loss, you should first go to the hospital to clarify the cause of hair loss, such as genetic hair loss, endocrine abnormal hair loss, mental stress hair loss, etc., and then carry out targeted treatment according to the cause, it is not recommended to blindly use drugs or prescriptions on your own. If the treatment is not effective, hair transplantation can also be carried out through the current clinical follicle transplantation surgery. In addition, in daily life, you should develop good living habits, try not to stay up late and ensure sufficient sleep. You should also eat more fresh vegetables and fruits, such as cucumbers and oranges, and try not to eat spicy and greasy foods such as spicy sticks and fried chicken, so as not to aggravate hair loss.