2. Unique black hair factor: The black hair liquid for combing hair, extracted from 17 kinds of precious Chinese herbal medicines and combined with modern bioengineering technology, contains unique black hair factor. In the process of combing hair, the subcutaneous hair follicle is directly replaced by the tooth end of the comb, which is easier to absorb and effectively restores the ability of hair mother cells and hair keratinocytes to replicate melanin;