Many ancient books of traditional Chinese medicine record the therapeutic effects of vinegar, and it is believed that vinegar has the effects of removing blood stasis, stopping bleeding, reducing swelling, detoxifying and killing insects, and external use has the effects of moistening skin, removing wrinkles, blackening hair and promoting hair growth. Therefore, shampooing with vinegar has a good health care effect on scalp and hair. Vinegar has a gentle irritation to the skin.