With the right medication, no studies have found any significant harm in washing hair with boiled water with lateral cypress leaves. Side cypress leaves is the name of traditional Chinese medicine, for the side cypress plant side cypress young branches and leaves, this product has cool blood to stop bleeding (so that the blood cool and moist, to prevent bleeding), phlegm cough effect; for vomiting blood, hemoptysis, blood, leakage (excessive menstrual flow or dripping), blood fever hair loss, juvenile white head and other diseases have therapeutic effect. The use of this product for internal use decoction soup or into the pill, bulk; external use of decoction water wash or pounding compress or powder dressing; clinically with fresh lateral cypress leaves soaked in alcohol, rubbing hair loss parts, can be the treatment of blood fever alopecia. Adverse reactions of lateral cypress leaves overdose has gastrointestinal discomfort; contraindications, precautions are not yet clear. If you need to use the drug, you need to use it under the guidance of a traditional Chinese medicine practitioner, do not use the drug on your own to avoid adverse effects on the body.