Bit.com reported on December 26, 2013 that Ms. Zhang, a citizen of Jinhua, was getting her hair done in a barber shop when she heard the clerk say that all the customers’ hair had been collected and made into soy sauce. "Making soy sauce?! I almost pissed myself." Ms. Zhang found it unbelievable. It would be disgusting to use hair to make soy sauce. However, seeing the serious looks on the faces of the shop assistants, she also felt a little guilty. "The people in the store said that there are protein components in hair, which can be decomposed into amino acids, and the soy sauce made from it tastes very good. Does it sound like that is really the case?"

Jinhua City Quality and Technical Supervision Shi Qingqing, an expert in charge of food safety review at the testing institute, explained: Soy sauce is made by using the fermentation process to hydrolyze the protein in soybeans and produce many amino acids, so it tastes delicious. According to this principle, various protein-rich raw materials can be used to make "soy sauce". Hair may contain a variety of viruses and bacteria, as well as a variety of heavy metals that exceed standards. Improper treatment is very harmful to the human body and may even cause cancer.

Soy sauce produced by regular manufacturers is fermented from beans, which takes almost 6 months. However, in order to save trouble, effort and money, some small factories have no fermentation process at all, not even a boiler. To process soy sauce, you add salt and water to the sauce. Soy sauce contains amino acids. The plant amino acids produced by regular manufacturers through fermentation are not harmful to the human body. However, these small factories without fermentation technology use animal amino acids, which are harmful to the human body. It is not suitable for your body and the country does not allow its use.