Blood is hair. The rise and fall of hair is closely related to the rise and fall of blood gas, so there is a saying that hair is blood. Hair is a traditional Chinese medicine, and it is often written as blood residue, such as blood residue charcoal. Compendium of Materia Medica: "Hair is blood, so it can cure blood diseases, tonify yin, treat convulsions and epilepsy, and remove painstaking efforts."
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